Malicious PDF — malware analysis report

Static analysis result for SHA-256 21844dc34c260b41…

MALICIOUS

PDF

69.5 KB Created: 2021-05-08 18:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8d5817010bfc70780d9ddc6ebba20f1 SHA-1: 7975893c388782e8a8d6a93534d0d59699ce5909 SHA-256: 21844dc34c260b41c020da9282e87c75e18c6d4da4cb1c0754452f8c730f13d4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://adance0112.com/upfile/editor/file/36947503596.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/42ebf47b2491a0ccdfdbab3aec5a5afa/gosapus.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc85f2d6c---84571258077.pdf
    • https://abofahed.com/userfiles/file/18557124992.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8gsba7kgo4d51plnmb57vldr7a/bijubolo.pdf
    • https://al-farh-iq.com/upload/userfiles/file/30984436551.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a7d1e0c4c3651e085fb7f07e6a842b5/34755636175.pdf
    • http://alpha-cp.com/userfiles/file/16671983159.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/57d257ac4f38d459eb211e13c70d9cd9/22900046707.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2c8886059a15be39beb58973d6f25616/96129153034.pdf
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7fda2a69f---20678202529.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/48b52a916f6f86db8fbf4b517274d288/retegafimipop.pdf
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ona9vkl160rtv5gkf35lh1hb40/rebokanofuwubuwujekejan.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c88d05371f---15717561683.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef2fefcc7---8408314074.pdf
    • http://amandamaitland.com/images/file/suzugopujumar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=3d+wallpaper+nature++free
    • 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_off0000d3f3.bin
bd3fd9a3839a8d176ce747fdebd4c3f4b21361f61289f9040a953d329ab6e0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 5016 bytes
font_01_sfnt_off0000e529.bin
92971ea94f670d0785822f8edd55f573f3bc496c839f580b21c83b44ec5411f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE529 10472 bytes

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