Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f485faeae2ea7d…

MALICIOUS

PDF

84.8 KB Created: 2021-06-30 10:13:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b7d2d833e28feee41ce175c0666cc314 SHA-1: e2e92122f6ea8141715f48591e0d225b5368e118 SHA-256: a6f485faeae2ea7dd1f7a8098d8501c1bd7d9b50ab464e41eef820f3a61df7a6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The file's structure and URL patterns suggest it's designed to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/552b5b3fbc8bf6b1fa52a68dc2fe15cd/87227439068.pdf
    • http://voszveszprem.hu/_user/file/notadatefu.pdf
    • https://angel-juicer.com/FileData/ckfinder/files/20210625_D1CE6EB2C7DEADB7.pdf
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f079d5214---80253578952.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d7c812e9848ea94040db10f2b3a2c016/jajomomaxajolirixupipu.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/430e36c437ce8671d25b7a26a897e3b9/29885498430.pdf
    • http://laclonghotel.vn/upload/files/47103373433.pdf
    • https://bachson.net/upload/file/bibaz.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3344b732a---24082320141.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/1c459e7a02fd3e55c15937dcaebba4de/natixofubegirekowuwojamam.pdf
    • https://dreamscapes.ca/dream_scapes/userfiles/files/daralelatugas.pdf
    • http://tecnoservizi.com/userfiles/files/33476593703.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/3c7d5735be1f9218c15612f88f81e1f7/tezotateseguxuzubefano.pdf
    • https://istanajpdua.com/contents//files/52136492117.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608713f9ac23e---naruvanemivo.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/df7dd4b66048381052a39f0212a15bf1/nutofabaluroro.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d2626b964---vodigizubixulabe.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4843f0e3ed8f8d363ed0dcc4e6ccf8fe/8707169479.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/240991f16abc9d013b7940150d42caea/94122375483.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3253cd579---50173677136.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/62305e27eab8da3d79c174936cc0e5da/14809045282.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ignorance+and+uncertainty
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e975.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE975 16792 bytes
font_01_sfnt_off0001018c.bin
76596fb5047f927a809270e069a2a7278f0ecc61a1f9ad759ad0e84e0f69f3fb
pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 10496 bytes
font_02_sfnt_off00011958.bin
d7a5655b5eba79c93fcb4a297dabd2a648da88aecbc91c94d4f4d0bf3b7faee1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11958 16776 bytes