Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8c2638f775031d…

MALICIOUS

PDF

87.1 KB Created: 2021-06-18 23:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 8a0010767c9db5f66455c4e5a25067f2 SHA-1: a5ad640b77bf151326f932f896242896557ac58f SHA-256: 4a8c2638f775031d06f0f36048fdf0b2390fd9920c690c9dfd9e6a7b2ac55059
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure designed to redirect users to malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c0107293d83---vuzabanonufokoditikagojez.pdf In PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd8328ee4---pusomudowipokapupedaw.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a189b09e18d---pubimudapodog.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vubelereke.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba3beb9d79---74733068650.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/73a8c2dd0a9e2ffacc4d68c403a9ab41/3501325081.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099b728ebff2---ravujoganudesagawujenadu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/13a77880cffb9709e0b66151014c23ea/fajafozagunigetota.pdfIn PDF document text
    • http://alexhoffordphotography.com/temp/files/file/55113110561.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/35378162751.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/1bf6f37010d84a0b8493057f98b21259/jijeje.pdfIn PDF document text
    • https://hmanagement.net/userfiles/file/81196468978.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c715da7b60---sijedura.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/bf4a950adb29f1b9681f02d49f4b9d6d/kotagojisavis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=substance+painter+combine+materialsPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e22b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22B 4032 bytes
SHA-256: a849b76f9363f6e208a6b3b97826a54f7c8e554eb642b232eb64e54d4f8be3d6
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 5324 bytes
SHA-256: 5fa65742312deb17b61220bf5f4a53bb6233a1206756ec699c19704605649161
font_02_sfnt_off00010291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10291 3052 bytes
SHA-256: 6d6fc09d8d88002abde98c7946c0f020e98ec7a4afa56bb1e874333e4293e191
font_03_sfnt_off00010f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0C 12348 bytes
SHA-256: ba290fb3d28c79ae348021703a69d3a677a90216339fac0720caf344a418533a
font_04_sfnt_off0001386f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386F 16336 bytes
SHA-256: b7ec44cfe2208ace95a2ce43e698390e22c67aa42018be4a86f0f90cbe714ace

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