Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a4c2746e5701ce…

MALICIOUS

PDF

89.4 KB Created: 2021-07-30 13:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1fb9014f7ff22c77e830365da0b228a3 SHA-1: 03884c21b4b0211a348b72fe03ce583ff3c7ff20 SHA-256: 11a4c2746e5701ce709c0cb42d1ecdb21a3397f5e41dd59d0cc4e7e805a4722e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://campermagazine.tv/public/file/suruwil.pdf In PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/6e95593ff1ea5ce7743bb8e5eb73e2d5/10037444809.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/76219428853.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc90b0b85f---72196117373.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608285671e63a---3377614309.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/vukapisiwunadugik.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fd1795b72---pudixowawonudazovax.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95d75267c9---lanisafixa.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b0352654b---bopufutidiwuxek.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/c7842bc3d49c4f155acbcf23cd9ac943/81659316568.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/55869333204.pdfIn PDF document text
    • http://renovator.cz/files/file/61178098692.pdfIn PDF document text
    • http://ecole-belair.com/ecole/file/1185757094.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/jizutav.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/susuvamaxil.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4fb56c8649e22f1b0068bcd51fb17e8a/gimekobomiru.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/47702147541.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/pidet.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/lipawujelawinupimo.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/bazipovonatu.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/7a8d8f4b8d8c01029368009b1c8b58f3/goriwajurekeledowaxezelaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+full+movie+on+youtubePDF 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_off0000f825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF825 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11037 17408 bytes
SHA-256: 1a143644ad2aec093c0a06913d9be00dd4a9d0d2a58bc5606c80f121bf78ecb1
font_02_sfnt_off00013dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DC4 11208 bytes
SHA-256: b4ad51ebe2c1116f36192aa3c68a4dd5368854fd723f85c17b0cf478b276f212

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