Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1c60c00ab10c07…

MALICIOUS

PDF

82.3 KB Created: 2021-09-07 03:13:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ff8675417330c548b6d6a859f272da07 SHA-1: 78020e2fb46dea3f817ffd20add7c036d9fd82d0 SHA-256: 4b1c60c00ab10c0791e323ea88b3c6790adf2db30cb2236a790fd7f90f713f3a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host malicious content or phishing pages. The PDF structure itself does not contain executable scripts, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://ketchas.ru/uplcv?utm_term=carte+planisph%C3%A8re+vierge+pdf PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/0c57b5c34545844398ecaa1032c096e1/seretopop.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/47665683869.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/71427100552.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/34594855473.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/vewafuvijefodawumosebim.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f1adeed02a5d7f7f1b4f6346aa41c06a/pukeruxaw.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721c9d90dea---42501243467.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/61518277624.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/3mg1h37ftu9lg9a604p6v684qs/fiwonadanawuvasefofepef.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/oppmg1r57efdiqsjb44v8jai6u/12737121148.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/zabikaxogefamezuv.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1625500224_14b53f9994.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/843294343d96a523f6c622d58bd7b4ce/tujupik.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/f546279fe95e3c4ed282972baa03588a/vukalixetimum.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a26cde59899---derulenudejikezeveb.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/cd73f64e4e2dacd301004e34b9a8a9c0/sedabesa.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7208cd633---mexes.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/jmiup7p3gqvg3896unklap3u5c/6424177014.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d187b45908---rukalosez.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf2912e098---nakawesibeguwixi.pdfIn PDF document text
    • http://aven.su/userfiles/file/82475290970.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD680 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE97 10912 bytes
SHA-256: 755903871120d56fd0a2ea424255628317753ded391fd6ddc37c77efc25ada28
font_02_sfnt_off00010740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10740 20036 bytes
SHA-256: f86d3d9c309dda12f3545ad026f48b7fe017c5943335263b704e9d93849fb3a7

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