Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e683c596ef30d6b…

MALICIOUS

PDF

89.4 KB Created: 2021-09-18 18:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc49e32456f67a56b8e2bf97413b0485 SHA-1: f69c2d16f0a32cb459a7fa5289992ab23e338ec0 SHA-256: 5e683c596ef30d6b2b1dc9f227ac5228d0b56efbdd0365076b17a0cf27fa16cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised WordPress sites or disposable hosting. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=bowen+2009+document+analysis
    • http://eros-arena.de/eros/userfiles/file/44106423737.pdf
    • http://syntra.pl/userfiles/file/28852884892.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/xarimuxaneke.pdf
    • http://roycraft.ca/userfiles/file/lemer.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/1a15ef8569431a99c6cae5ad5e582900/89193765364.pdf
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/livase.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/rozen.pdf
    • http://derkwoo.com/upload/editor/files/wiwosesewalaxunek.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/pekexekifus.pdf
    • https://www.lipca.com/ckfinder/userfiles/files/58000593590.pdf
    • http://krajinar.cz/soubory/files/39715618922.pdf
    • https://chptravel.ir/data/file/lidawixuv.pdf
    • http://tuyothuyluc.vn/webroot/img/files/lufulivariviga.pdf
    • http://impressivetravelvietnam.com/upload/files/57355805438.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a152495f37---14023260311.pdf
    • http://naturestuff.nl/siteimages/file/noridokufo.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/68pvs98653jfoji8miinodp036/12208178614.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd7937050f---43001865168.pdf
    • http://congtyvima.com/images/Download/kexeluwuxokovi.pdf
    • http://mrpokedb.com/uploads/files/vopewarotejokuvi.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161453106be6f6---83699233202.pdf
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46310966119.pdf
    • 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_off0000f4ba.bin
9b95e43e270a0dd9a3b9478d4fe642aa9045d56724b1c8fde4ec543610054c0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BA 11196 bytes
font_01_sfnt_off00010f10.bin
5c98d4bd51831d8452b9f7058f3a95180b8e25d72b4340a8f003a19f71f63517		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 18776 bytes
font_02_sfnt_off00013ffd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FFD 16792 bytes

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