Malicious PDF — malware analysis report

Static analysis result for SHA-256 93d287c3fde6d3b7…

MALICIOUS

PDF

73.6 KB Created: 2021-09-03 23:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 1089edcc44d023d4c2423c132433cabe SHA-1: 8b5af91f71b54fa6bffc1a9d1a30b3fea61fd8fb SHA-256: 93d287c3fde6d3b7e4dd82595d7919dbf5cb03eb151dd240414044284c03fda6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the finding that the document is structured to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d08805460a7---nokikekusemimagaduga.pdf In PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/6a160d9dfbf79cb3b58180e2a51c43f8/96810145241.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/foperekidipuxipaduwopo.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608950d84e255---17960724904.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc061bc4b---38506767059.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/95827728.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/kunurimurafubufegu.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/talabizinevaxopogigot.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/9876064721.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/40264893099.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/vixakoresuk.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d7d177b02---48316783405.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081af6e34f97---3744332469.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/64294915409.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/42557341234.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/5149113649.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/91860839737.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/76652379561.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/kunolukejirepabajuwi.pdfIn PDF document text
    • https://bonekarusa.com/contents//files/11803811211.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/93127291145.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608e68eec6c7f---mugodugazuratif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=neumonia+en+pediatria+pdf+2017PDF 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_off0000bcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCB9 16852 bytes
SHA-256: 21bb79295f8b89931f33eed03c091eafe3bc1f94f47deec65a0ec3662b66e0cd
font_01_sfnt_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF2 10864 bytes
SHA-256: 4996681d82df64303a91683d315bb9930b2c8e78e6bbc18be118252652db0537

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