Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3e6b7179b8247f0…

MALICIOUS

PDF

91.3 KB Created: 2021-08-13 14:48:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e95bd51759a39a27b235cfa33d09b6b4 SHA-1: 475694b7787903cfa15c1195a655397b84111dcd SHA-256: f3e6b7179b8247f000d2f683c70465967ad277d0cd084e23920addd09ca910eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is designed to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/ebs329d2lkhge94it7p1kkqitc/megazesu.pdf
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091fb9e47710---levopanejipug.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/95d052b6df7c4411518cf03bbe232197/sitog.pdf
    • https://elearning-chemistry.ro/userfiles/file/27687680315.pdf
    • http://accessiblevehicleservices.com/userfiles/file/47157027600.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ae58f3136---78699526444.pdf
    • http://prestopc.it/upload/file/bikalisijelamesededemotid.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5fcb8aaa95---lizaralifo.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/nukgkrhj7smrtuvv3r6o61i5en/fejawopiwolukuf.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/dad1c0ebde23231ca7459c7c87f6f5b4/92438552157.pdf
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50ec61c7b7---kaderuboriwaruliwarufuwo.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/33837dfa6f1075db0f111de035dfb3f4/nizijojipegibunumuwigo.pdf
    • https://bisnismedsos.com/userfiles/file/mevad.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/20d34c00d9229acc1b471ed3604786fa/38115644785.pdf
    • https://mzlpro.com/web/img/podborky/files/66234019213.pdf
    • https://bisnismedsos.com/userfiles/file/7088698007.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cab3155c9---gofipupabusidago.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/6d2d57a044f4b0f94e13ea043ad8da37/27592460995.pdf
    • https://usssecuritate.ro/userfiles/file/74106861125.pdf
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jikisusonojofoxud.pdf
    • http://tindangnhadat.vn/upload/files/gaxigisilonoxogomokew.pdf
    • https://tekmaker.com/upload/files/30812885906.pdf
    • http://aaaexpressheating.com/userfiles/file/4203492336.pdf
    • http://elitaliaweb.it/upload/file/lizejawixe.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4f89233bb0---bumodumo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=need+for+speed+no+limits+hack+ios
    • 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_off0000fd1c.bin
e2ad4a727cc8db980c711e86a0f871ff0725a2164635d634a932865d370bb704
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1C 10952 bytes
font_01_sfnt_off0001164b.bin
1921cd619e9d9766db84b5704270c904bac8ec9aa6bb43fd2444291f23d47977
pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 17724 bytes
font_02_sfnt_off00014519.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14519 16792 bytes