Malicious PDF — malware analysis report

Static analysis result for SHA-256 88287ee2c34b40db…

MALICIOUS

PDF

99.6 KB Created: 2021-08-12 04:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 013261dbd9b91e8d010b92dc54e5dcf8 SHA-1: 724954b685a317deea97c931912cd2a7d37df813 SHA-256: 88287ee2c34b40db8f05cbb6822f0ac10eaa6d718efd413c6513cb650d15f414
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded URLs. The heuristics indicate it functions as a link farm, with many links pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to obscure malicious destinations. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://wastran.ru/uplcv?utm_term=mount+and+blade+warband+build+guide PDF link annotation
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/d04f8kk00gmrvk37v9nk9p7v93/wakileje.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210723_7FA3EC8080D26052.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/377d804480793a49c43961a55eaa6d7f/sadejelogorowojizifev.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/473eca5bbc05eef670358f0a3b458dd7/78835544579.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/d7a229488b70407b82c70752b61a2e1f/tuxuru.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cee93e9b8f---renilimepig.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/fozatukuzabifafarew.pdfIn PDF document text
    • https://argumentua.com/i/file/69995656094.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/dosedoneraborasovufutiram.pdfIn PDF document text
    • http://agrion.org/upload/fichier/pixaz.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-8/20210508083301965686.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085093a127e3---44996476409.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c647418149f---nagimexiwamuniw.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/rufubilolosebupu.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/525c1b8fa08fdac179192a7dd21640fd/44807099691.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/pisiziro.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/dapozokuwages.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/kagutepusekudijusonogir.pdfIn PDF document text
    • https://kamedia.vn/data/file/61602885653.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160945689941ea---woferibewijolonagobuvakas.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/zugodurov.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d39b0c937---73925009029.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/4946342603.pdfIn PDF document text
    • http://qlinairnv.be/userfiles/file/venezawakiraduwu.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000139a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A9 17496 bytes
SHA-256: 8069f5ac31abdc725a208eb663129fe2e5cf2b29781cb6c10492382629b77dd0
font_02_sfnt_off000167a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167A5 10576 bytes
SHA-256: 71ddd4e9a9a440a0de6a89730c94cc3fe29f97fe3040e445b7068ec6f2bd13ef

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