Malicious PDF — malware analysis report

Static analysis result for SHA-256 49c827131b9bfb5b…

MALICIOUS

PDF

109.1 KB Created: 2021-06-30 11:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 139fa2954894ef72a77c722025175fef SHA-1: f2bbabad9c400f4907922b6bbf2e3bab4f21c1bb SHA-256: 49c827131b9bfb5bfb200cca7fcb9ed28f539a1ee7eb521c120d9f14bd0378c0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://trouver-une-ssii.com/img/pics/files/jadojuvef.pdf In PDF document text
    • https://biovuspharma.net/userfiles/files/7919003500.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/65777340100.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/qmg1mt53b2g6gensoufu9h2i00/zedube.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/52141293280.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/tomajufe.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/a7831f5ed2ce3dfb7ca5d8cd98ea7890/serotutori.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be463bdc952---77154356805.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/55896704497.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/hq387mjb8mdnvc8cfbu3gajvva/redifogesi.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/5c0069e3a471968dbb45d24294291c1f/64387712145.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/ec1fbb6d5a90277f0a7782331436ca2b/wifukizanafojabadulox.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4257b250cb26f97ce7bfeca05ecd2c5e/34241510486.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/nelarupakibimipepod.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/do1eqpcece4uhh6v3f3pf0ud9i/tanitawuvubugewexopo.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd37beeea32---80437493147.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/32ef44388fdd746219f2fa18c3ed1dc0/dawebuxigajasuma.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7be222b0c2ad2a115040c9f928011f7a/wadeselatefakisozi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/vusuv.pdfIn PDF document text
    • http://funperm.ru/content/file/2126908080.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/xiwevuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=linear+programming+using+excelPDF link annotation
    • https://mediaget.com/userfiles/files/19567469247.pdfIn PDF document text
    • 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_off00014945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14945 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001615c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615C 10776 bytes
SHA-256: b0c30ba8c4978d7ee18dd6ed89ea733d10e7f6d584e38c39a7e8ebd997a73f0d
font_02_sfnt_off00017a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A1F 17412 bytes
SHA-256: e514c63c371e1b01eb7d858de1b98940467ad02dcd3e05c0b5821f5d8c13505d

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