Malicious PDF — malware analysis report

Static analysis result for SHA-256 de84f258f0f97aaf…

MALICIOUS

PDF

80.6 KB Created: 2021-09-07 09:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38a8a50bb293ce31cae2e7a035e9f457 SHA-1: 2837b6db8af7e9cf4f167d3ca58f48e8650eba10 SHA-256: de84f258f0f97aaf0b8201b0d7a8fdc6e4b659bcb4b98cc747b2ff61cbcb0286
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e03190bae71c6fe426e9674facfb4de4/tukigaf.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/93677841786.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebb3d84b4---72106850827.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/97095859599.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/soduwudoxefisavolagedis.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021515937298224.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/83845921790.pdfIn PDF document text
    • http://klassn.com/ckfinder/userfiles/files/94351083876.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090528044706---gadenejiwuvapelojalizixe.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20189003362.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/84747251286.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/molumadid.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/uf3ausrfeagfnioih7v6ukcvo3/38930165217.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/47833903031.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kumovirumazek.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/botixovonodafopiwa.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1336c4854ad095c89cb2ff8b84e56396/gororaga.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/55100041740.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/85783188721.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd65adbb033---pinuwuvedafamofivon.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505013358269318.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210811185551_jeya6k.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/61831670988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=risk+management+in+banks+pdf+2017PDF 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_off0000d708.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD708 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1A 17240 bytes
SHA-256: f07a6366728b13890f760b4a9da8cab3452fd81439831a067faab9f586c8c45f
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 11196 bytes
SHA-256: 2de6e1036feee7e8da47d0520ac4ab940befd3bcb9fbf42d3e8760c12181afe8

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