Malicious PDF — malware analysis report

Static analysis result for SHA-256 541f2ba8154289b2…

MALICIOUS

PDF

82.7 KB Created: 2021-08-25 17:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29aae0ec07391bcba5da092ee9298522 SHA-1: 5763d7597292183635109b154d5df09b4c0079c5 SHA-256: 541f2ba8154289b22cf4f53b5d755cfaa9dfb3016ac32f0d4ba2f3aaf8d61cd2
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many embedded URLs pointing to compromised CMS uploads and disposable hosting. The presence of numerous unknown URLs suggests an attempt to direct users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/864d187be9869d549a6f5d25907e8ec4/xeber.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/5564v6g5jgtstqvhlr0hck3hr4/52728409731.pdf
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/8n9glma5c76v58q6liocllucu7/dimegapezuse.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4c3f258763---38889028901.pdf
    • http://montrealinkwell.com/clients/c/c4/c478fb9048b4d856ed1aa16e2301f982/File/68810957410.pdf
    • http://studioingegneriavaragnolo.com/userfiles/files/37105209864.pdf
    • http://vamaconsulting.sk/userfiles/file/powikevujunux.pdf
    • http://robalton.es/Albums/images/file///bisevazu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b32eeba6648---95505757599.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/70999406027.pdf
    • http://chronicles.ae/userfiles/files/67546270205.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/27368602392.pdf
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/68217156932.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/luwagotokarekumakimevipab.pdf
    • http://xedaptap.net/userfiles/file/xivapakulupo.pdf
    • http://ongxoanhdpe.vn/upload/files/62617997364.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/06a28444d27ddd2daf5e73b203b8fcd9/xafiz.pdf
    • http://thekitchendesignstudio.org/uploads/files/tegukave.pdf
    • http://demirlermetal.com/resimler/files/ruwuvu.pdf
    • http://studiosiciliani.eu/userfiles/files/78080611280.pdf
    • https://muguet.fr/sites/default/files/file/numuzuvobubopu.pdf
    • https://beysukonaklari.com/ckfinder/userfiles/files/gomojuxekaperizaf.pdf
    • http://jamesandsons.ca/userfiles/file/tumigekuvusilekiniku.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160958759d7d1b---zejasowipepu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=love+my+life+mp3+download
    • 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_off0000dfbb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBB 16792 bytes
font_01_sfnt_off0000f7cd.bin
95666917c513656af7610ea1a272b67ad85154b603fb9fd109da66491826800a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CD 17336 bytes
font_02_sfnt_off000124af.bin
170c9017d85735846edba59217de1cc0a8f5c3670104138679fe0a1b586e6e4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AF 10688 bytes