Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3f81ed9d5dffaa…

MALICIOUS

PDF

114.5 KB Created: 2021-07-13 02:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1296ca2e8ffc47b4579aa00a314bd1f SHA-1: f5c22fb15006ff6f7f2df88b5676de002de200b3 SHA-256: 3e3f81ed9d5dffaa52f6e635dfe3261c8b2ada846684cfb0376a09ed3fd8d330
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple high-severity heuristics indicating malicious intent, including random and compromised CMS upload links. The presence of numerous links to potentially compromised WordPress sites suggests a tactic to host and distribute malicious payloads. The ML classifier and ClamAV detection further support its classification as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9639

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead118c42a---16797857659.pdf In PDF document text
    • http://massimoandyuethui.com/clients/69227/File/memejasugumave.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c571a8c67e---figiboxusewez.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/c1c5ef1ab068965a2261828a6035bb05/tedasutawimizufesipo.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/44843469812.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1608b20b60e1cf---72562595330.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/kusosowodoja.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/cfculusrnvsqcce648hmmbu710/maleruwukex.pdfIn PDF document text
    • https://clinic4lab.com/upload/ckfinder_temp/files/20210707104835.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/18092696004.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c92b83d3e51---loweloxeboniwezefovi.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ead31eae208211647fe55d80825825dd/mesopidupexumobeg.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505125903444730.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/f3495d0f4957c80eeaebfe78cf1a7161/petawanaximemewagawel.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731f1f594e3---73571716290.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/luvozitiwibujukoje.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/ac0b7d8dc9a066327a2b7b88d0b4aad5/98757115537.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b04d30ad34b---jojowitu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895f65245d2---93295551739.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1089539249609c1707245f6.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/gugasa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/j8hlv7g84249g7er178do59jc3/nedenurujoganelabafo.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/k59lflie3geeq3ggtgb67dnfm4/zukenevodofat.pdfIn PDF document text
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/xekosozopuwagojasev.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedbe5f171---kuravufanazozamuvijewezam.pdfIn PDF document text
    • https://scriptdd.com/_file/file/79546493646.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/55880243191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=toefl+official+guide+audio+tracks+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AB 18388 bytes
SHA-256: d3c989690fcef324530fd339d46b399d49ae3b87a49d647c2c14106eaf49122f
font_01_sfnt_off00017410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17410 10892 bytes
SHA-256: 9f1549e2c9a9c5e56b42e7667607773b6714c5a261badc89860d18808fcb8aca
font_02_sfnt_off00018d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A555 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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