Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85993bb76221b5f…

MALICIOUS

PDF

77.7 KB Created: 2021-09-01 09:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 094af9e4e9c3024445736194bd57b5aa SHA-1: 084b8633ac26b12d5e6d2ecb073447bc0a3ff46e SHA-256: c85993bb76221b5f9146bf8f435183b9476db9aaecd43505a6f86164ce7af6a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted, but the structure suggests it's designed to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/k450fo3em162oelfnkajhtegf8/foduluwuzifodijamagaxej.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec01096d48---bukuvunusabadigurelozodoz.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/3266810852.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/gopevanig.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ii5761u94rqe3m797ifjgnhi76/66725551331.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57100c50f6---xelugot.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0f5c2ea7b5d34e9bc27cbe6265eea89c/62908353503.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/33806771450.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ac02ccf1ce0---75168369115.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/70429517672.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/4e774d89f47a16fc6e0a3afe364762ce/9872297113.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/705125f721a47596c05ee5ea29feff0d/50357731125.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/11726128571.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/viwugexomefevesu.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/jajamix.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/34082106516.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/7468a170a1cccf1f9267d9a1027268b7/gatoporelakuf.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/063ba9aaf01782f82d07e18f1ba61011/xuwibezulusevuxas.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6836f4fa0e---mazowojakepise.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/93204364756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=oxford+dictionary+onlinePDF 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_off0000c2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D8 20464 bytes
SHA-256: c85e0139a69d4667c9c2d415fd1acc494b2c6b57ce98ef4f007ae61299140f61
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11138 10544 bytes
SHA-256: 52e041ae4902248e898f5edc38c456f28240cc9c195c3628eb061b2b2a175e7e

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