Malicious PDF — malware analysis report

Static analysis result for SHA-256 80eb62878781ef20…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 06:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b13c2b90f88eea2cb5f3b5577df8b1bc SHA-1: 410272e9eae271a5cb3c75f0aa286f10ab869b27 SHA-256: 80eb62878781ef209e63e23d824cfd629a9c896ec9accee24483ec02c8341207
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous external PDF files hosted on potentially compromised websites. The presence of embedded URLs and the nature of the heuristics suggest the document is intended to redirect users to malicious content, likely for phishing or to initiate further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://vieclamquantri.net/upload/files/32594664410.pdf In PDF document text
    • http://lineshare.net/upload/files/20210702055050.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/d8b1f5bbc32dc11c2f2a347eb4b60c30/17777272131.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/52362479130.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e66f665cd40359493d7585f43add7e0e/gaposeterimedejinenani.pdfIn PDF document text
    • http://myxroad.com/upload/userfiles/file///45536150480.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9afc00f7df---88776490567.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/17107922002.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/l18pfjn6vibaa7tld3ijp0urk1/felixiwupoporagani.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/7334237933.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/dedorevuzawajo.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/e9b736ecb22621f867df099309a26757/80910947578.pdfIn PDF document text
    • http://limoride.net/gallery/file/pozijum.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/84083701000.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/56fcb961a0a66bdd6e39dab124c072f4/60879502262.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/db2018a995df4ffd0121bf2427cc9a73/sarafavuxexuzudulud.pdfIn PDF document text
    • https://kuepancong.com/contents//files/pasonuwovufif.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/14068213326a7d91729148cd563f9d11/32075640017.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0daad6ad8---kopolik.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/75571212727.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/9daf124b3cf7b279330ff64ac29e6f32/dufisome.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/97639889071.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/80206979394.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+many+english+classes+are+required+in+high+schoolPDF 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_off0000b9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9CE 11156 bytes
SHA-256: 4a459a24d0c2c72bfe15cc292edad58a1217bdfe9493cf785c41b41eb6cb329a
font_01_sfnt_off0000d323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD323 15644 bytes
SHA-256: f9a69b700c671f6f17c4af8850053630409d0eeba43226daea1a17d38ca95a8d
font_02_sfnt_off0000fa10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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