Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67e8a94246a0e49…

MALICIOUS

PDF

94.5 KB Created: 2021-08-08 15:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80b3c21b2057c1ff0a3202f72becdda4 SHA-1: 50a4fa98e9afd8a1f7b39ee31cac5a7f1f027ce4 SHA-256: f67e8a94246a0e49cb6d44329c76da189d22ea2ddd04090303614f70ad419ab7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm or redirection mechanism. The PDF's structure and the nature of the URLs indicate an attempt to direct users to malicious content, likely for phishing or to facilitate the download of additional malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://clove7.com/userfiles/file/53184372256.pdf In PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a377d783408---bevikipezexuterufat.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/fcaacc57ef772b9d5d7ff300eba2cbc5/gozarajufilodozabud.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aca1eea6faa---53430834985.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a0daf242dd309e6206448700b0326df5/72850362660.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/99918758077.pdfIn PDF document text
    • https://asiajitu.com/contents//files/pepiwo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/bfb6e9718801c7d7b19d0529a1bdc2bc/sovewazojez.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/708ef6ea8815d7c216529e6b4976c4e0/16928547761.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rekuloxubiwukeruz.pdfIn PDF document text
    • https://tisuputih.com/contents//files/2320112516.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/77068469031.pdfIn PDF document text
    • http://watch62.ru/files/files/41758903248.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/13647961634.pdfIn PDF document text
    • http://liyangah.com/Upload/file/numapenoligogunok.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607a309400478---71543800820.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/jasasoleniwamin.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/koguti.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/82011966612.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609268f989d6d---nirifosogopelivujuret.pdfIn PDF document text
    • https://luminex.pl/upload/file/75190071479.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/15144947636.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/c141a922ddbc7bc9e47e43ae2c088525/16922674490.pdfIn PDF document text
    • https://www.dgaspcsm.ro/ckfinder/userfiles/files/47787093886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=lego+harry+potter+5-7+walkthrough+a+not+so+merry+christmasPDF link annotation
    • 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_off00010a59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A59 11388 bytes
SHA-256: b77b5a669ba185e46336b43f14a1aaae1c724ce75d682b4c86721c3462ab20e3
font_01_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 17844 bytes
SHA-256: 00206fb263549b66d136168a00d6a8178ec9b785b2ee4c060d55dfc9670adef7
font_02_sfnt_off000153e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1