Malicious PDF — malware analysis report

Static analysis result for SHA-256 50dae09c27fe95d4…

MALICIOUS

PDF

80.5 KB Created: 2021-06-25 15:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15a4efec284fa3ed490b447e0179ec4d SHA-1: b73fa9049ccfc97e9086710c4e708b7feabc7375 SHA-256: 50dae09c27fe95d426e16b8fa699bc69f57e929e95b32b363f97ae09007fd0c4
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://tolgyesvolgy.hu/userfiles/file/6883230811.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/aa839143a38ac08de6521ca6d0b094cf/sujapizupodibokebidafu.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/anhpsnmelciepgrvta29mfdcna/64198993867.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8ce494d72---30789711513.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/47589722267.pdf
    • https://tylbm.com/Upload/ckeditor/files/jobimasuwifetivogozipuzi.pdf
    • http://kisikana.hr/userfiles/file/wawiwozesanaposa.pdf
    • https://immo-macedo.lu/userfiles/files/85781369695.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797555acd5b---31970192063.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/d7fkio8685vbas1vahourgbc3o/87607462635.pdf
    • http://nacyc.jp/Upload/file/muvikamoluxukanenadepasu.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2f6d44a54---28428867695.pdf
    • http://xnucleus.com/members//member_images/files/vezewitewetoxureben.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/77918538691.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5ed79a9d0---6488007694.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3679ba116793c4b1436bb13cc1928e4b/13881061888.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=factors+affecting+sn1+and+sn2+mechanism
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d92d.bin
52f8feadc3c576e09da7f2c1862a9271090a5ee93675c6ffc6e1e45b38920a02		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16468 bytes
font_01_sfnt_off000103cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CB 16792 bytes
font_02_sfnt_off00011be2.bin
8e0e54aa62741b81a6f076f172be2d7aa6123a0da86ea3704c6af510b9135f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 11024 bytes

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