Malicious PDF — malware analysis report

Static analysis result for SHA-256 942f13496cd30a82…

MALICIOUS

PDF

86.2 KB Created: 2021-09-04 05:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87ef7b2e96bfc014a3b7d6fbc1663a30 SHA-1: a5df649fb860e581a10c8a4fe97efe0f58aaa391 SHA-256: 942f13496cd30a82d1cb3870663087fe97ba051ed4b3f1b24e4959780b651fbe
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload storage and other disposable hosting sites. This pattern suggests the PDF is used to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ventensis.lt/public/ckfinder/userfiles/files/sikofemovidutejo.pdf In PDF document text
    • http://samuiluxurytravel.com/Uploads/file/wemeve.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/0aae5fcc7f469b50ed58241032af3806/31429810311.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/503444533.pdfIn PDF document text
    • http://c-amc.com/upload/files/49145086869.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c1bcef6046c9ee47ad1228c916176a59/puwefibitanuxapexexenilo.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/770f6c8dab5e28f62c79a13a1673c487/65327684703.pdfIn PDF document text
    • http://poiskvod.ru/images/file/noligemuf.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ec75e8a1395061e556262096fc172b0c/pumogezati.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b57ce6a70---34123754125.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/5i1nlh8nj6mefn0vvvm0vqgm5t/lidividovisokuwidopod.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/vutijewufogirejo.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16123cc856de7e---jakamu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160c11814a6096---vivakod.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/mabopukemonunure.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083998018851---jugoguvejivixikisexi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4252118fd2875663355c462ba2d7f198/nelilagikil.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/60580180748.pdfIn PDF document text
    • http://www.520amis.com/upload/files/64729997794.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/94b38c3a79d3e28c35f056751bd78d5f/92175282929.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/92321997255.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/mawumumago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=paragraph+development+exercises+pdfPDF 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_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 18524 bytes
SHA-256: 9c0eb4c847ac0099c257d996d455019cace2fd10050c1b0d39f3122e99b8a62e
font_01_sfnt_off00011907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11907 11236 bytes
SHA-256: 465ea3c2d555828914325d0e6f10e2719e8017b2ce6f1d4dc423fa57b2dd1a98
font_02_sfnt_off000132fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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