Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c612981f8db265…

MALICIOUS

PDF

84.2 KB Created: 2021-07-03 17:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 21e4ef14c7207a9c8bfb34d13fcacf6a SHA-1: a4416652f08fa6044ae21a9051bb63a65301a6ab SHA-256: 91c612981f8db2654890efb8a55820d242843248b025079723b6858ecd7880ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The file's structure and the nature of the URLs indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://infrive.ru/uplcv?utm_term=corneal+ulcer+treatment+at+home PDF link annotation
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/bigokimepenutebipapusimem.pdfIn PDF document text
    • http://cocoal.com/uploads/file/vevuwilijej.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f491256c6---vufabit.pdfIn PDF document text
    • http://hotelsandmartin.cz/files/file/2154021456.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5a381a4e5a30ce46ef7dc62ad86ba05e/wamufevipetijiguxo.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/42409227152.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dowubirizidiwavuzej.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a2a6cfb0a86ea327c902d968db710172/tinadikogepajigolutak.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/jagibanenejifixusufi.pdfIn PDF document text
    • http://sun-eko.eu/files/file/94283280347.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/duxozaso.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9952542897---vikalalumoge.pdfIn PDF document text
    • https://leavingcare3plus.ch/userfiles/files/28317839930.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0ac7d5b3548b5621e0633070470df368/xivimukekaviki.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/j7hj13q2evv9prmrn9ajjpb4i1/xoref.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ur1renuhm0s1qpecboq6f87h67/fekovisixonazadago.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/26320958208.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/xezotalomojifarovepew.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1fa838e25---72225196140.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160788c16e677c---faxadubiwetavudezigetiweb.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qcqc71preofr0ft1a9budpafa4/84464747576.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faa2682b29---buwepoxiw.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/82441002067.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c6ef61619cecf319b108844b59811219/23093006064.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_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 10368 bytes
SHA-256: dd5be90a19ee85c1bc5952172eef96e8576086858873d9e40e70381a055adea8
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16272 bytes
SHA-256: 1905ae7a7f0d83f4d65a02bceb9a64540f97e7de32b491f077c1162ca19330e7
font_02_sfnt_off00012b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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