Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a7efa3aff5b1f8a…

MALICIOUS

PDF

82.4 KB Created: 2021-09-02 18:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 22858b6b29ac37f448bf20020475c21c SHA-1: e972c20e1eda149abdf95fb418bc55b2dfea158d SHA-256: 2a7efa3aff5b1f8a7b27f45162dbd2def68fe58d73eed3ae3a7848dd651e2ca1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external resources, many of which are hosted on compromised websites or disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the structure and heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://agiusfuneraldirectors.com/files/file/96751878396.pdf In PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/4kd6vc7jljbea8bcjdcml32cls/wenodabezibilalubumunafol.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ef3480752463d5578121514ba08fe4db/tezupiginagerosudeg.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/17784358484.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/sanamojezibirip.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/lojim.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/82631640343.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/disimijidimatasawugasore.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/bofibojeneliziterapegofa.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/kajewajubogumakoru.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/pawalumosufafir.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160929a6e10744---11837476615.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/93728236865.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7489ebdd1---877853026.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d0275cdd---71684245360.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b65aed0b383---zejawa.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/dosefobesoxekakepabufin.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/10920461133.pdfIn PDF document text
    • http://melhi68.com/clients/69549/File/37303434444.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/46858360707.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/25083897265.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/xanawad.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/62257320270.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/pibipadupesinozatibutuv.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219cb2449c---gegadamifasewud.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/niqqnj1qlfhrkndh8kiuqmotu7/zewufev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=network+security+assessment+3rd+edition+pdf+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC79 11324 bytes
SHA-256: e2936a1170886731a5c48a361b4b6cfff6ed4078a54a7add2fb59b5aefaaf580
font_01_sfnt_off0000f741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF741 17128 bytes
SHA-256: f8fe6348e9ad1fdcf505320532f41b894d7b8c6bb66fa614ff6e61ac8394a50b
font_02_sfnt_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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