Malicious PDF — malware analysis report

Static analysis result for SHA-256 d016db4106dd5377…

MALICIOUS

PDF

83.8 KB Created: 2021-06-09 18:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269b4b043c041879aaf230b412fd1cdb SHA-1: 305de8afe81656004370b178caf37d381fe56497 SHA-256: d016db4106dd5377d967d54a3da7210491ab159cc6646313be6c1070dbb533d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to distribute malware or lead to phishing sites. The document body, though heavily obfuscated, contains references to 'persuasive opinion writing examples' and 'wkhtmltopdf', indicating a lure to disguise malicious links. No scripts were extracted, but the PDF structure and URL patterns strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ketchas.ru/uplcv?utm_term=persuasive+opinion+writing+examples
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be3c41bbaf---33227930991.pdf
    • http://ekolojikweb.net/upld/userfiles/file/kasijaliwezuxexap.pdf
    • https://ajitcoatings.com/uploads/tezirelami.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/uuo5ioeo3m8eks3r747au4olj0/20121708467.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2e1fac94b---31317143362.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/b17pg8lu5nkd1520erhrtau013/12500419142.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/tmp/navagib.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f11513faa---17105489559.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/440n30tvfmeuqjs6kldv1pgr1e/13088346730.pdf
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/ngja57oc6phq211c87nr04kjj7/musovomojorax.pdf
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f2f45d83f---pufuf.pdf
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b29554fa6318575f7602bd79ec6e2833/10390902109.pdf
    • http://wonikqnc.com/upload/editor/file/1623097907.pdf
    • http://orderkiwicafe.com/uploads/files/zedivizaxe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe5a.bin
56a995cba413107021e8c581ce5a7fde38d822424dfef93ab2291fa76532f3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5A 5240 bytes
font_01_sfnt_off0001102d.bin
9f2c8141d825237c1acb1a51f764d777a7b982c5ae3232141a861846e1fa5e74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 10580 bytes
font_02_sfnt_off00013448.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 4324 bytes

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