Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c75493b31777179…

MALICIOUS

PDF

68.8 KB Created: 2021-10-04 07:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: aca71fd336d04526e7d46f29c62af0aa SHA-1: dae1bb3ccb03f1d4ae704da5e7996df04c6ac2cd SHA-256: 0c75493b317771795bb13319a8fa82a1d0d34c69afa8495c6ff825b271e6968e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded links, a common tactic for tricking users into clicking malicious URLs. The ClamAV detection and ML classifier strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://anaksemut.com/contents/files/benorusomof.pdf
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/fabedebowika.pdf
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/sifixivalelogatubofexi.pdf
    • http://birzebbugastpetersfc.com/files/file/2875605632.pdf
    • http://serenetour.com/image/upload/File/fimepenifajokopukajad.pdf
    • http://edv-denk.com/userfiles/file/83561195323.pdf
    • http://accronline.com/userfiles/file/zivojovosowe.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/4qonh78ej9eje0kuo6gujrbvi0/6702867981.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144e4683e154---50173376260.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130774078d43---maziditigowuwusozowumi.pdf
    • http://limeitec.com/upfiles/editor/files/negilux.pdf
    • http://filippodelvita.com/demo/userfiles/file/60294332348.pdf
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6750981305.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/gizugivawepunaruwipus.pdf
    • http://rigdrilling.org/userfiles/file/retotawatef.pdf
    • https://takarasushimn.com/userfiles/files/74397328414.pdf
    • http://pataibicaj.hu/userfiles/file/gijaluxotewivawugusemere.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/f7da45be088d900d7b4730882bb01a41/pufidurazegos.pdf
    • https://hoongnau.com/upload/files/99976850738.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140769a4874f---fawuzujedovigik.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/439193b2303297328cb1cf8c40c3c3d4/mirapikugederuto.pdf
    • http://domadoma.cz/userfiles/file/modali.pdf
    • http://intersonik.eu/upload/files/junibakol.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/jhicupke8lcgup2m07sfsd99lf/698441736.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+long+can+frozen+chicken+last+in+the+freezer
    • 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_off0000b161.bin
66616ae2d48ab12a6f1ca652c097a41e0ace9cfa592f29f44fc9d44889754710
pdf-font-stream PDF embedded font (sfnt) at offset 0xB161 14040 bytes
font_01_sfnt_off0000d479.bin
8486b0f5952c2b81775ebaa0787d0369b546088fe05da9593c210ee61178b2f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 10844 bytes
font_02_sfnt_off0000ed96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 16792 bytes