Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8a740c602bfbde…

MALICIOUS

PDF

89.7 KB Created: 2021-06-26 00:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82cb8ae254ca5de3ff486c3f88a1e13c SHA-1: 6fe4fe1dd3ab2530a333bcf3e9173a9fc38f3598 SHA-256: fc8a740c602bfbde6d099a8f495a1febabb4568b9c503cb387048c90455b9f03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and other disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded content indicate it is designed to redirect users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crysiq.ru/uplcv?utm_term=us+postal+service+domestic+mail+manual
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/3d068a042fbead09b1ee7cf343592c0a/63699845095.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/tosinorunodazekegowaxura.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804b0bb39c1---47252812790.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/36vsbfvkr2p7t269ldgpi3vje7/96333517178.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/p455tif3cdgdqu4jitin3co9d7/17178290166.pdf
    • http://paliukenas.lt/i/File/43985658251.pdf
    • http://www.tobywells.org/media/fckdir/file/27464160756.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8d89ac4a5---pumamodipufobikixa.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u74ld1ump8ojf4v5lg3i4opc2i/49702992912.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f9jvoabjg78mn7hkkr6t12qt87/pagutejexadewovilamop.pdf
    • http://absolutelyneon.com/userfiles/file/jivivemezatanovaredepebo.pdf
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/6420f779a378e01b5897735c1cae3a7e/10193115703.pdf
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/qcicmfhfmer17h4m4u1jet8me8/36672190269.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/oanpnklm5vo9njjou93dk6b27h/nofesujedivorokoxixipiva.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160ba58ab501b3---42802569583.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/13ff4ef8182fc5e87faa139f19fbe496/44202029854.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609954c29fddd---9063442187.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608656608f2ae---1698794796.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160adbd8c6e83d---21919466359.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a270f5544a4---48044238704.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd754a2207---30357628012.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47162afadf---dijen.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf8b1529a---fivuforazowotevepo.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57424f224---74702782807.pdf
    • 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_off0000fa5f.bin
f262fc4d3175630c3f02b641a388e7d49b8b8f52907262a327b894727798acb7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10848 bytes
font_01_sfnt_off00011375.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11375 16792 bytes
font_02_sfnt_off00012b87.bin
16fff62e523297cc27ce07479e08e8bb10322f084b61b456397da64c8bf4784a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B87 17832 bytes