Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e44a6bb8c7bc2f9…

MALICIOUS

PDF

80.4 KB Created: 2021-08-21 21:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1f69db546bfd07b3d3ad1ddf8aa9c26e SHA-1: 4fc0bfafc28a19a5c0fd49232c734892e5a7e19f SHA-256: 9e44a6bb8c7bc2f9c16c3ff1a27c34ca4c46e87df96bc8f314961e363d7eab31
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The PDF structure itself is not inherently malicious but serves as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c47fdje3uvk64cd6sqov7ibp2/fogosad.pdf In PDF document text
    • https://suadienlanhhanoi.net/upload/files/ludipijunoselu.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210706_89DFBF867694EFCE.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210610024435_kl8dmg.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611312072e97c---93863985462.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/1d52e911553bd1572035e2e9a4f4fca5/vibesilogesekotisimabax.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3fb688753---99852733843.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/65324147631.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/xibemoluneguzetegaj.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/f472a4a66212608cfb4e5fb829fbfca5/5173967548.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/xizonogoxosekitabatiwe.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfa12c4b82---87552617021.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a1180d9dd---zofak.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862bb5de8cd---22493988480.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b494561c9---belumadafexolodema.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/a8e43e402df4a4163fec03a2e7ccd112/nobagevovenenularivamogaf.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/dobuzijefu.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/nipud.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ba103e078---90023608519.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717303a617c---88047345065.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/20a3d98f7a8655076d623d9167179e65/28174424197.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/60438284688.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/vurabeziwizofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=engcon+north+america+incPDF 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_off0000da29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA29 10448 bytes
SHA-256: a0dc06db688201d619e45558a98f55f8687d798715164c9951466cde146cd3c8
font_01_sfnt_off0000f1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A9 16372 bytes
SHA-256: d84747d22c86427a0299b283ffa4f046c20c34a4a4d739cc509e0e8c2d89558d
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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