Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fee3e8c425562ce…

MALICIOUS

PDF

95.2 KB Created: 2021-08-16 11:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8342e04f9ea2b789e0f233cdf8790318 SHA-1: 6d9603d79ed5668c87d2b6183ab0536cf98d9dd0 SHA-256: 9fee3e8c425562ce183aa146818175fdb481abf33007bd41e43d816d2ff2b899
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs and link farm heuristics point towards an attempt to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://mikomisushiwc.com/uploads/files/18263818374.pdf In PDF document text
    • https://activepymes.com/pub/file/gikizojavowoxakogem.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5ff8494f9---ruxik.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/82240152557.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770750866a---wajamenutivak.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2996ba9359---vironibazokef.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/diwapoxadasidoxu.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/bafokorimag.pdfIn PDF document text
    • http://castel.lu/userfiles/files/kisuzuluvisowuzawifina.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/27735204809.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/2832235531.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/83674426157.pdfIn PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/gokifiwasurojiw.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/18991730466.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///36384353720.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/d1oio5tla1f0rjqpt5rnbknk95/pawuta.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afcdd554eb5---60818721771.pdfIn PDF document text
    • http://360mart.net/uploads/files/16797201592.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/30263672804.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cars+2+the+video+game+psp+downloadPDF 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_off00010f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F24 17592 bytes
SHA-256: eb8696e68ec2b92ae975e85f9a09c8e02b6a6b847ec8893034fad936d1380443
font_01_sfnt_off00013d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D5E 11144 bytes
SHA-256: bc62d175421677547a06e072b4e717bf9dbe222f458114aae66138df0ddef839
font_02_sfnt_off00015722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15722 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1