Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff77caa5e24fc520…

MALICIOUS

PDF

90.4 KB Created: 2021-08-22 03:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a4ba868936cc7238c4287d354f84c4d0 SHA-1: 5b05a1eb5d41ab4db138b6d451e927e20e28f2b5 SHA-256: ff77caa5e24fc520c585ca4159616b269d89ce08c871beaac5b22801144ac5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Several embedded URLs point to compromised CMS upload directories or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF structure and link farm behavior are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://webmenuplus.com/images/file/nubisagunonisimunuvaji.pdf In PDF document text
    • https://suma.ca/upload/editor/file/99369366567.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021717156128365.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732fce35a6f---babosobekogija.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc92e0b61de---87260964633.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/duzejafasatonogeduvatib.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/gowitodafemarobigatibox.pdfIn PDF document text
    • http://akademibt.com/resimler/files/95046741393.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/21172915291.pdfIn PDF document text
    • https://cam-ceeds.org/ckfinder/userfiles/files/75055750995.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/53aea1ce0d83f90d7bcdcaeb590d62f3/lerojazik.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/7516684057.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c11840eab8---99875109361.pdfIn PDF document text
    • http://acril.ru/ufiles/files/50780945502.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c89e817ad35---bodulufofoxisorominonaj.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ef34c296---72554002499.pdfIn PDF document text
    • https://bursac.net/userfiles/file/kiletomu.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/jekuki.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/8bgcmfs1gtq66biaj88relhngs/wojelexogex.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16083b68d59f7f---jokagadawekelabelomekabe.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/45pv6e0n12lrto1g9m46r7etq4/kepiwukon.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/2289cbf9f5de6955409e250d99a4351f/gaxutuwedivude.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/69158491768.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/ed1jklhghjsspgkocv65iidu71/4957506941.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610066bd4c1fc---35630592564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=traduccion+de+lenguaje+comun+a+lenguaje+algebraico+ejemplos+resueltosPDF 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_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 11192 bytes
SHA-256: e5d980f4dc4c74ba3e9372931cef6e199d214afece5c179a90c5d0d2f704d0e5
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E0 18924 bytes
SHA-256: bf1b66cab0e00c2b8d61deb52a998fdbe7d1f093c9626d4a0fa16a80ccd9d50c

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