Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4cfeb7105412f2…

MALICIOUS

PDF

106.0 KB Created: 2021-09-18 11:59:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 32576ea185e0a1897858b28450184fa4 SHA-1: 293d460f52d757fc56201f76097e11df6ff579c3 SHA-256: 8a4cfeb7105412f22af90bbc2b46c40e24705b4f517baa7b1c24d366b3417a1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://vinhomeshaiphong.net/app/webroot/img/files/13480985003.pdf In PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/bajomuku.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/20795815383.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/66356279331.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/giwonewavunapudafikelod.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kimujes.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7e07e53a---77654955454.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5bb96bd9c---58907491706.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/39664311279.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/68758352550.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/21337492488.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613489e6d68e5---jikup.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/wunafizulikoxadugosevulo.pdfIn PDF document text
    • https://lifetides.ca/cambridge/uploads/files/69190745318.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xapufevafedume.pdfIn PDF document text
    • https://patc.fr/imagesfile/faxejuvakekegisekajepofax.pdfIn PDF document text
    • http://www.stemcellhairclinic.com/files/files/kowipana.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613393f53a599---xagaxelutoliwes.pdfIn PDF document text
    • http://montoaneli.com/ckfinder/files/16103552683.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614243391e266---zawaxekukazex.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/71731326252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=blokuje+reklamy+androidPDF 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_off000136db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DB 10632 bytes
SHA-256: 8b63a9122bc28e4f834fca4f9d7ce29a071761cc925f51e09d60c5a829506eeb
font_01_sfnt_off00014f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F17 21220 bytes
SHA-256: 424ca59d8362ab0752a347d7ba4645ee42384a6782f48fb953f575a591718dda
font_02_sfnt_off00018138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18138 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1