Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efe63356863395c…

MALICIOUS

PDF

86.3 KB Created: 2021-09-07 15:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6bfd84dfb3e1651655b647917ddd6adb SHA-1: bd55df088ee134fabc2aaab85e5d74aba980621f SHA-256: 6efe63356863395c5a495ea19287124cdc48b08e78abc61e4c69a060e7a73595
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://moyaexpresss.com/ckfinder/userfiles/files/84883066434.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d407c0423067bed7c256faa3d14dabc0/54634268525.pdfIn PDF document text
    • http://promocode.lu/userfiles/files/zuzaliwimafodosiwe.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/161573006.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/kepefubosawodi.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3e0906746b---26541700777.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160765fa85e2e7---xejoxilinik.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/27776487696.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/bunubemu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ff93a2d00---jinirisukor.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/35981533508.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/febuwifoguberape.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/8e455efd11214b263d1cde891d8215a0/98523516791.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/19551928410.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/338706091.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/fjgskdnnvefen4pn4nap5sg370/firadimisakesutonadakuka.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/zoluze.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/76dc0ddceced58d8c7a36ab415bbae7d/mubigodekogeduxovav.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/15350599197.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/18191251737.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/porupuradokadamoti.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee3feb722---89653983166.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608f032813140---80669277700.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/97543347098.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/9d8726f19ba63986e8450b8828ba2a35/78732288419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=depression+anxiety+stress+scale+pdfPDF 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_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 10832 bytes
SHA-256: 115d91dba55c889f75a8088d627d859f21309a5c7ac72681fb4d1f409f5a2d15
font_01_sfnt_off000104a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A8 17956 bytes
SHA-256: ec2258f72c3fba11b47d50a078300347cf75ff999ab86d6c6ba3b013e4221fce
font_02_sfnt_off00013315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13315 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1