Malicious PDF — malware analysis report

Static analysis result for SHA-256 29f10e9db9683a50…

MALICIOUS

PDF

73.6 KB Created: 2021-09-07 01:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bec291d045dfd2638eb7b553652f8c60 SHA-1: 42f2a8a701054f28e40d1351c7e1bd3e7b4c3685 SHA-256: 29f10e9db9683a503389ff7fa502bb3f7982fd964efc8a62ed1b173bfc36adea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised websites, with one heuristic specifically flagging a brand-impersonation credential phishing lure for Apple. The embedded URLs suggest an attempt to direct users to malicious content, likely for phishing purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=division+of+polynomial+worksheet+pdf.
  • 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://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af603459655---67154286297.pdf In PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/i80l5ec8o1o1ssu19l01jgsvu3/33276284199.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/dorepepobufemixovodanix.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/ah49mpdenl2td3hbm19tlb64ul/xiwukabiwinukaxabavig.pdfIn PDF document text
    • http://jfe.hk/userfiles/waluwekamonojetemofopoge.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/52c907bf7a186eb089539fbe5462c9dc/18797293573.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/jorowod.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/73759907064.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/16989710801.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a2185ad48fc---zukegavix.pdfIn PDF document text
    • http://ttlh.vn/storage/ckfinder/files/77068611018.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/a1ebad092e61981694ad50d75ef67699/munivegotibofab.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210727_EF4C1713A3F67204.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/torenegalovirubuwifinip.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16092facdda020---vemusutoleruzepuwuler.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/miwobutipeketow.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/08790480396e0e705f97107d3a06d76d/juwinetovekigosa.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4d748dce---56317618191.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683b97146c---xusebutubanudibitu.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/8146558980.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160850c47c68a9---suzorotokibaniripez.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/donuwizuvadilosewarob.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4539bf2c20---65662519648.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16075873b0966b---juvor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=division+of+polynomial+worksheet+pdfPDF 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_off0000bbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3CC 16840 bytes
SHA-256: 4188e38a9387f7fa0cca87e54c4fe17666f341fb6856e309bc8bf656972076f8
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 11120 bytes
SHA-256: 628da7423d33ec65de69d15dd859cff8aab259d4e5f4bb4c8350265849b2c0e8

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