Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf175a5cf49d083…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 08:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: eff6fa67f6e3e8e2da07c26b664e3b97 SHA-1: 50c6cdbac3667555aaf1ae7fe50aae32f6a6c112 SHA-256: fbf175a5cf49d0833d8e46afd76b7c1183f8e099f498d0365f976969f198cbc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads and disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hyundaihungthinh.com/uploads/images/files/rozutixewetoriligefakaxet.pdf In PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45db087c9e---85693242631.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/29144022227.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/56150543342.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/26254159776.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb5822cd5---57408987406.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/nokuvigevazoweg.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/61a3d2e6e50a572fc6149a8305f3265b/nomalozulop.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/o2p257d2eonheprqrsrshcamq4/27344782935.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/lifusu.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44326204717.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a0cc9b13fa2721ec9960bfd1d6daded0/kabibanekagupaf.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/67fbe80084b86ca4f2b312d712cced12/puxonotixabolup.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/12235167390.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/399764f13564e79228cede5d245e04cb/30681594248.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/runenopifitaba.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/93a8e1da32b692bdfecac2b78928efe8/70699616473.pdfIn PDF document text
    • http://askaudit.ru/price/bomojibesilatofareje.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/al31ppj1bsf01cumum7l0rk632/regazitorobifikavabaduse.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c85da9ef810---59243168323.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a977c297df2---19759857668.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/vosakom.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/60275137163.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/65927291857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=time+saver+standards+for+housing+pdfPDF 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_off0000c347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC347 11028 bytes
SHA-256: 6000526f4cf4c873da7182bf1ed634088e4534dd2e3aa8bed4cd3eef980ef69e
font_01_sfnt_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 16740 bytes
SHA-256: 1d009930c942c81d203cc31c923103b0d3217be9754580bc5ade8e9756bd888d
font_02_sfnt_off00010836.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10836 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1