Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd8fa86761020a2…

MALICIOUS

PDF

86.0 KB Created: 2021-06-08 04:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 725fe3f82f3987e62c3499c2635410a2 SHA-1: dbc323b1e50227c87dfa32365c2c25b91d8ef4fa SHA-256: bdd8fa86761020a2b99c948c308639e45fade21732b81f169ed9b0ff19ff8b5e
156 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The document body text, though heavily obfuscated, suggests a lure related to exam questions. The presence of multiple external URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://philabc.ru/uplcv?utm_term=atauzem+hem%25C5%259Firelik+esaslar%25C4%25B1+s%25C4%25B1nav+sorular%25C4%25B1
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16089ff94bcb1d---84752940789.pdf
    • http://consol.hu/images/uploadedimages/file/66039436135.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c09c184f3a---95211098682.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/8c3e8086792fa100dd91bf9d9da574c7/lezubetujefamowisar.pdf
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/a1854c84cd5e3136102ccff2913688f0/majodivap.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85d629de4---xexikubugipup.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075482815c55---48355260904.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/o8ltotdh7o5e60p2dr1ev4v1r3/duxewuvipomuketanigunif.pdf
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/54609914082.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a605f1d8d70---buvunavez.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd106069a7---wojubivetojerana.pdf
    • https://mabuksusu.com/contents//files/14026817261.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/o257o9t1bv5kp27g2gjfirv2d2/wapavuwujafuk.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/jg20n18hvefiodnokmc0l73ppd/jakesizonugeromebomubovor.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092eb66a3e01---72248066276.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f18.bin
22bd7acf617e94f1265ca3e0193b76d84df9ce5b25691238423b781aa05c36e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F18 5368 bytes
font_01_sfnt_off000120bc.bin
a4746d1fc5bf787e6201ee8ba7cdf4c2e9ab1c0b5d2b654e4412789ae546a658		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120BC 12896 bytes

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