Malicious PDF — malware analysis report

Static analysis result for SHA-256 4251d1cdd5d80275…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 19:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fb66430925575c27bba77e5a496818ab SHA-1: d4ec6af49650dca34683ad3503724bcf2cccde3d SHA-256: 4251d1cdd5d80275ae5902e40e04a10b002d616a8d81324127869c9ab8780fe0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/jaxamoxolemojupoke.pdf
    • http://ekbdrive.ru/ckfinder/userfiles/files/57773232659.pdf
    • https://organicfertilizerproduction.com/d/files/fapegatiguburefisidudod.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/2d7dec0aa0e3ddee4a1f7f16534cdc5f/38196884677.pdf
    • http://hysansam.com/fckeditor/userfiles/image/vibalitimejexawedi.pdf
    • http://hanleyresources.com/images/kiweboxazesewowitaxa.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4f1f30cdb---72225472133.pdf
    • https://muzeumkonstancina.pl/attachments/file/92849008935.pdf
    • https://kominove-centrum.cz/media/files/file/dasabudifogewomug.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/35687285562.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/s8bpbomi8e00vooo90pjrabis4/saxudinebaxulod.pdf
    • http://neonatal-surgery.ru/userfiles/files/tipubabekinur.pdf
    • http://186086.com/upload/files/gejamegoxezaruri.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ph9gsilc6lr8kn0cikgcc21d2m/refado.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081620d6b25b---waxopuzanegiguritonerawo.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/18504715974.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b2dc7b66cd4---surovalaziragewutivebis.pdf
    • http://szao-spb.ru/images/news/file/88729446074.pdf
    • http://www.asap-recruitment.net/upload/file/48817834995.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/81958189845.pdf
    • https://cjsc.se/ckfinder/userfiles/files/85455648208.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=detrimental+definition+pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000be9e.bin
3855da0f39b978af484cf3b6c4fc07a46cb7e967aeb602c6af3b3ca8f6099322
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9E 21908 bytes
font_01_sfnt_off0000f627.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 16232 bytes
font_02_sfnt_off00010c01.bin
9a74a5ecdc7a6b71f989d1c7deb3e5d48d7d26e7da57c42db7918e0bf92fb61c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C01 10492 bytes
font_03_sfnt_off000123c5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123C5 16792 bytes