Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1cdda2e25a1fa6…

MALICIOUS

PDF

64.0 KB Created: 2021-06-11 09:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 58dd58e52300c4f0a2d7bd8ccb20e678 SHA-1: 23e3ee38d5ac6edd40370f9285a3575aae037711 SHA-256: 8c1cdda2e25a1fa691cc0fee21756c0d92b2e6e5757f43660df56bf1d5919a3a
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to obscure the malicious intent through a link farm. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=agent+sai+srinivasa+tamil+dubbed PDF link annotation
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/gg7tsitl9mrvnu8h3s0bbi9fr4/jobemimoropoxojosaz.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756e79874f7---xerudogemovusideliriz.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/kizol.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/iccq011u1p6duavnr8e71bq150/lenavitovebenajetasemegex.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81809a7d12---98928952635.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/88136725887.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/1lmnb38cmn3pvn2bv2mlvm4a47/1720518346.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/46663591661.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/sotutebapojikifofivux.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2ae405351a4210a75f919472c6f965de/94646000269.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085b4110256f---53746161014.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v7sqret0affaqa035789i2rlp4/70552991078.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210507091906_1845635999.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/niferetele.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/gipavebobojebenule.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 5332 bytes
SHA-256: a99745f1f80c9dc2b3f467dc834b8d5b42a94d1f3d218e7935f2ef734ce91da0

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