Malicious PDF — malware analysis report

Static analysis result for SHA-256 4efe0bc5ec6120a9…

MALICIOUS

PDF

87.2 KB Created: 2021-07-08 12:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f00f9e41706aa890b58dd3df26e3620d SHA-1: 1dc19e883d4ae6fd286abbabf5ad00ab6ff19a8c SHA-256: 4efe0bc5ec6120a92d407f632cb76cf79f15e3658cd3399f86bbae5e40064d72
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm hosted on compromised CMS uploads, pointing to numerous external URLs. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user consumption but rather as a vehicle for hosting links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ac7eb7f41e63b3869d9ddf05bd1c94aa/ruduzokanow.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce69ced634e---notusuzozejinonibelitu.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/zijalexa.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/17989301796.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/vexivumodosuzuga.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/shblhtck65enuelm844annfdl3/nebidonolatexisufageris.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/95356de6736ced08e0413b99ece6e49a/mozodufonutewiduforoseke.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4f87de52a---50596861950.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071b665ddf25---jofekuminuredawofetitesod.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/5206024221.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/83449900979.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/f5f6de905b75a1f48d7a0b52df2e3c34/59434413152.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dad44774---45315680131.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9tssoq0n4ic6cbqbgsd2e8f5q4/daxipakajamadumakajozepi.pdfIn PDF document text
    • http://candientuvibra.com/images/file/85184762112.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885307e8359---39534061541.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c3e675360---89286405707.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//55177120371.pdfIn PDF document text
    • http://www.centralperdana.com/file/76486458727.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/jboqntjchkbut7ngak43v6g7o0/52278805010.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/76394385576.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/n0usj8k54juekf4v4rnhf4eicn/xobupezinetexa.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2383002f70---33980257254.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/87620739352.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/87389010966.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bceb6e3ab3208a88534a596cc91703c6/79721363171.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=brownsville+real+estatePDF 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_off0000f31a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2C 17424 bytes
SHA-256: 483a8168f9f505348824a0aa660b51fa6630b7df0e8523fa726972da69402c86
font_02_sfnt_off000137c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C3 10308 bytes
SHA-256: aa80faae90f6fef8c121fba211332ceecefc448c84c9a6b3161d6d07c2c3a9a0

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