Malicious PDF — malware analysis report

Static analysis result for SHA-256 81af44b3c786e689…

MALICIOUS

PDF

94.5 KB Created: 2021-07-25 14:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4eaa1d4161d8b3ab8a04658279bc6569 SHA-1: 088819e716349a7d8225d357b820e04a51130e57 SHA-256: 81af44b3c786e689b9d1ba4d10e8c2e7f4c75d5b3d46b3ce83b5d3442ec5dfb6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/d21dd3fcfa635ef9c8d709c61d177b50/86621564919.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/6bf2d20b6aa3e65b5dfca17df8380040/12324482518.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2da4060c0---219411351.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ar32553e5luo8fd8bo2el91i42/xanidepuvolozerelox.pdfIn PDF document text
    • https://anaksemut.com/contents//files/xuponopuvotaxun.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a5cedff14---dirijivaxasap.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f6cd60aaa---25000067709.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bae12f8b1---vamugulojopomof.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/41433919026.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/da90fd74f805c4b949cebe02e4e72f8b/lopiporovojel.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc20d9d26c---ranigononofe.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/d2caed508ad88eebb9f6f50e35babead/vewesigogadu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/ppp8a8gdq9ehd94no4bi6r8jgd/kagof.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/56860805248.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/d4fad1d6335d9cf7c0fa0f4985815bad/dojedipaluxakivusajiroje.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075195c19c82---kopuxulujevalunogunimi.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/c881654678963a9f46b6cdb7dce31ff5/vizujejobikulifuwoninev.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608326ba16bb7---30664178827.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/18842904026.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/wumut.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/xitemiri.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/cdqqo2s7rfm446p5o6nfkdl60b/vivofotila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=tibia+druid+leveling+guide+2019PDF 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D93 17400 bytes
SHA-256: d1ad1e8fc8746681336bb64c9be9e16a52b32fc1ddaf530901fb286ec01570f0
font_01_sfnt_off00013b22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B22 10768 bytes
SHA-256: 7ac7030427906a3c00c731bb40a61d7096836a0cc9e2fbf53efcb955935f814a
font_02_sfnt_off000153d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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