Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db1d7be13e12922…

MALICIOUS

PDF

74.9 KB Created: 2021-06-01 11:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 004ccb0bdcbfd66434634c81ca967323 SHA-1: d91fd1caf806dd86866f602596929afa5ca76ed1 SHA-256: 7db1d7be13e12922bbe71c3227c9487a51162c666b345fd43dd87547466aa176
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to host and distribute malicious files. The document body, though heavily obfuscated, contains a lure related to a grant timeline, likely to trick users into clicking the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://archism.ru/uplcv?utm_term=erc+starting+grant+2021+timeline
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/ui3gkq4lki3nt6skq13u8r1lb5/46583059672.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8a2ca499---mojazik.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/6e75fe6b4557096cb724d6dcbf70022c/72433553455.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/9becacb4f7cb8d756d375229a95acc47/vijovatonedawozepasosumaj.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/6doebd3ne0tqsiq9nc2ojq5734/80640137096.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/qg9q032i6itfhvdj8b0vctp1f2/67298978067.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dj8jal5cv1nft7fl0vv67fgda7/lesufemejojure.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606e447c01030---bulakigojutipezewid.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095bc453953f---30956630406.pdf
    • http://novussiteyonetimi.com/uploads/file/32642481934.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe059c5a2c---pijakekabaxazafagisakadum.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8af2b8305---tujabilirepew.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ecac17d3---63479193683.pdf
    • http://alexhoffordphotography.com/temp/files/file/vazub.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/b1749umtq7a71ul6okcdqeukk9/94845532640.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/5c4qlkbbik014895ubj2s69b9m/64397324734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e63f.bin
2f2306d542fcca444e795934f1a96fb9694a3bf79512cd6de24c83bee4a7cdf5
pdf-font-stream PDF embedded font (sfnt) at offset 0xE63F 5404 bytes
font_01_sfnt_off0000f891.bin
7f6fdd3994896c5d0a00b9d6c1f512cfca0f054a70c16074f6e6e81256f1e5c6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF891 11240 bytes