Malicious PDF — malware analysis report

Static analysis result for SHA-256 95bd4e1d25392503…

MALICIOUS

PDF

70.3 KB Created: 2021-09-21 03:57:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16d8e56f39482bfae7ddc9c013ccda75 SHA-1: bbb9897a64c82862659462488acfdc51a816e29f SHA-256: 95bd4e1d25392503b65da79a5af3bd8892f91a859ebb3a7b386bcd3f62dbf210
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=androidrock+voice+changer+apk
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614471a284327---65724574885.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3e01c182---62875503015.pdf
    • http://www.heksan.com.pl/file/93886998619.pdf
    • http://9jamail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/98865708354.pdf
    • https://balajihighfields.in/userfiles/file/56004240366.pdf
    • http://opuspoint.com/ckfinder/userfiles/files/51331003830.pdf
    • http://3wsystems.com/shipinc/userfiles/files/43536960786.pdf
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/c669e5b2e4628f41c9b2566e29e4fd2d/34313572558.pdf
    • http://accessprecision.com/userfiles/file/39608495345.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/22159055174.pdf
    • http://robbes.nl/media/files/9052190028.pdf
    • https://sua.vn/uploads/userfiles/file/tibewosemo.pdf
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/32704584344.pdf
    • http://orlickachata.cz/files/files/43342941404.pdf
    • https://charlesstreetvideo.com/userfiles/file/57927306956.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614069585d815---50430633168.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147453542ee4---sakisipez.pdf
    • https://krantiservice.com/ckfinder/userfiles/files/7373457474.pdf
    • https://anandamsanyal.com/userfiles/file/nuxanozajuturewupe.pdf
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/11105681721.pdf
    • http://acecaalcoy.com/userfiles/file/70817988455.pdf
    • http://terwaarde.be/ckfinder/userfiles/files/zewedinopunoli.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b4db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB4DB 16792 bytes
font_01_sfnt_off0000ccf2.bin
d558cda59693adfc89f011d8ee5ae39aee64f3a6603e7652ac5e1d7c698e8327
pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF2 10620 bytes
font_02_sfnt_off0000e4f4.bin
062f74edd906a5a642c5c327bdf6d2b8e48c8d4f5ff71fc116b81fda692a75e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F4 15588 bytes