Malicious PDF — malware analysis report

Static analysis result for SHA-256 b346b8405a045e6e…

MALICIOUS

PDF

87.6 KB Created: 2021-06-28 12:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89c08cdd4ee0469be605661e4b8f9e2a SHA-1: ee7f465b17a48800761883d38e8925eae6a7f338 SHA-256: b346b8405a045e6e7a77868580b02842179067b4f0be773c6c4baec77cdd1d96
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high confidence score further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://wastran.ru/uplcv?utm_term=assuming+things+meaning
    • http://rogo-rotterdam.nl/files/21069795701.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19dec4478c---75386894575.pdf
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64bb9037c6---woven.pdf
    • http://novichiha.ru/pic/file/12519306049.pdf
    • http://phantasos.org/userfiles/file/mefidukunepen.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/a552c74629cf4821a3848d698eaed8a9/94987516446.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9be3a2abe0548b4be8767f87f5dd38eb/tuviponeni.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160a81a15e027d---4855346073.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160756ad5e2998---57636845816.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/oa212cot7k0edeef59v6aqafe3/vimitane.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8ef31fae2950f27ecc415e9117a56a8b/53725529750.pdf
    • http://www.truca-taoules.com//ckfinder/userfiles/files/80961436853.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c9adb32de46219471a14d8dd3dc010bc/47018496212.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2caf0b10df---buwilodulirokasagewomesef.pdf
    • http://centralgiving.com/media/userfiles/file/naxigetiwakowetesusipedan.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/a4vvs4h64f4788a8f4oi0lrgep/46325002647.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/70pddhefcier99rlu34q663rr1/97449344982.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/n88d1vjg4sn6duk9k07eac1b50/32246310686.pdf
    • http://splogservice.ru/content/file/pafedoxev.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607de11fbd95b---gefegurenakulul.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/5b70b5c696f089def2fb9110739961ac/70085221323.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/b512e7cf7283dc9de88020b5a336fce0/72783628658.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pfgupkg9nho7cv8dblurtr6b3o/86148771788.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/7be6261443877c8d7c08d4b0e14fb7c4/jizeb.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ea8cafedc67e2e736c32ade2d6d8a0b8/wegixulerusiluviza.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_off0000f647.bin
f0684957ff618b3cb02aee079f9d9dc28fda1ee27eb131966dd518b7829c43e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF647 16828 bytes
font_01_sfnt_off000121c6.bin
cbcb3b48f80d5667d9357ff2d049eec1ff3b517b4c338897416784f9ba1688ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x121C6 10368 bytes
font_02_sfnt_off00013908.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13908 16792 bytes