Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe9b9173e39ca62c…

MALICIOUS

PDF

71.2 KB Created: 2021-06-01 01:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faa56959642d2d113fcc9274ad039dd3 SHA-1: 6ec319d54d14923a07fb5561734dea830e309bfd SHA-256: fe9b9173e39ca62c53a3cecc3f6b16782cb57425e3df2dd5e0e5383c1d7957b9
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites, likely as part of a link farm designed to improve SEO for deceptive search results. The presence of 'utm_term' parameters and the use of compromised WordPress upload directories suggest an attempt to distribute further malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f22baef88---pajamazafixawuranikakem.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a6a3775bd---46182914130.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/9gs0jf3bb0s6m9erpphlcdmg8m/11093817556.pdf
    • http://allprintusa.com/admin/images/file/laxagirufikejud.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81f2c162b---66289859365.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984795c0f72---72400284723.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/dq7kg713t5nfoo1ugg1j04kod1/pufus.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a19a468b7b6---25193064432.pdf
    • https://airflow-skateboards.com/upload/file/xinifumolulibunoririle.pdf
    • http://ahkjt.com/upfile/file/puximebebiwuvibi.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/12985943a2a58d0d75050308bc4c0ae7/favezejiwakiwa.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/o2bdrbkmejmh7if2i438d5ne7s/ladafofile.pdf
    • http://sewakendragroup.com/userfiles/file/77067989348.pdf
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd50b3a6e3---xofamifiterodinivovasaj.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609e27ebea981---tunowibot.pdf
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/a18cf8c28b6026cf93db3804f45a789e/67357317268.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087dfa78138a---vexuzevujubuzexonixopi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ace+ventura+full+movie+download+in+hindi+dubbed
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ced4.bin
6ab46f12474e68139f673941b37e9ef79510a81aedee0b72b2ed9b9adda6591a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCED4 3288 bytes
font_01_sfnt_off0000da97.bin
059284a39e9f0bb060f53e1b2e09e12582cf841f8211389bf39c4d64edf0abf6
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA97 5364 bytes
font_02_sfnt_off0000ecc7.bin
e646ea1aba2b6d1773019c4098062476e77df96e5449225b2438a0b98971c96f
pdf-font-stream PDF embedded font (sfnt) at offset 0xECC7 10208 bytes