Malicious PDF — malware analysis report

Static analysis result for SHA-256 688195a6a0065b58…

MALICIOUS

PDF

89.9 KB Created: 2021-07-27 15:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2fc32df5c8bb16b0f1e92c380d2bb7a9 SHA-1: 8d06c8d050dcbeee36150ed40db875d15f067ce5 SHA-256: 688195a6a0065b58abd82d4efc612cf0fdbae5851fffc5dc646367cd7240beb4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fairmonteast1969.com/clients/876766/File/nikoguf.pdf In PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76bbf62933---xujuzedav.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/c3098d26efff7a0b1dff49f509c3e5f1/kelikiguxopedumisasev.pdfIn PDF document text
    • http://elma1.ru/!upload/files/43196169578.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2c57691d68421c68dbad667973df5750/senosila.pdfIn PDF document text
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/dozedexilumaxiremugedozo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/qull8set7aud1ac2q1lsd5hp2m/rexara.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/63037754916.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/53778900666.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20216664596151.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/72633973913.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/56866167221.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f31b77855328c2c8663c9f555cdc8067/virunefozajivul.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f20c506f0bc---golepofidapidonuja.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/gezawu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608506bbae365---debokujus.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/tibajalinobojobi.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a9d11e9f---vibiwit.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/rudigabelonozetulen.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/39140447075.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085cf36d8e7e---81579541682.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/3275f1673849d20efdf8a3a4d7b6f719/matakuxikiravuluvixiwixe.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/1ak5sugbe0tsg1n5dfejr2mgb0/jaxesiwikifapo.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/45964550730.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd1e33fbb---mimabutofomibozil.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/kezutunibejolijoxasixitob.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/dafanefiresukaxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=what+order+do+u+watch+chuunibyouPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001117b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1117B 10684 bytes
SHA-256: 5034e9eb6997a61bddac594868f3cd5541f0c3f9d684c81e7596c0013e197e5a
font_02_sfnt_off000129f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F9 17304 bytes
SHA-256: 3c10c1b9b5df503faed77567b088867aba4d25192771b44b727a91dd3eeff8fd

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