Malicious PDF — malware analysis report

Static analysis result for SHA-256 d468b8907c792bb1…

MALICIOUS

PDF

89.7 KB Created: 2021-08-21 22:29:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d14e49fa382c30c42547fe1740b3b688 SHA-1: ca179ca609e5f4307350c654866d181d86cf3967 SHA-256: d468b8907c792bb1370ad6bbf23a6a2225049e5dffb97378fb2daf2217419ca4
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a credential harvesting lure. The document's structure and embedded links suggest it is part of a link farm designed to redirect users to compromised websites, potentially for phishing or malware distribution. The presence of multiple links to compromised CMS upload storage further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf7a8760bd---78880149248.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5421e1f0e8ea18394aa25a6e83579ff1/85039524733.pdfIn PDF document text
    • http://rld-carbon.ru/file/87807782686.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rmvi1klkbts0qicrvu5nphbsg1/45798946642.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/92336135745.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a962a480781---55801638640.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25a0690391---83271985016.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/vamalala.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/5810239668.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/38778877244.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/27492043366.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/93065523064.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cf863857746---pojaxitubezuvalob.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210625102957_712568536.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/c7425d306d32d9fcf1fbcb0107d96fed/wekusevepakulidubopi.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5j55drrqmeqbap7fitk7cencge/66254751317.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/jepabetisupofekediv.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/38347478705.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/5af96aca154c764cbdd010cc249b7f33/21899571182.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/jegewosunotazovan.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8f73af83c---lemasonixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=polycom+realpresence+group+310+setup+guidePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED08 11420 bytes
SHA-256: 7fbd82af74bdfaba49e3eb241a06d84c59f216df0ec2fb93dddbd79b584fc7cb
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 17792 bytes
SHA-256: 4481de238fd77a55b1741dbd99188e820a527825864b436bda074b9e95c4428e
font_03_sfnt_off00014e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E8B 2124 bytes
SHA-256: a57ffbce5f1fc5a3ef62cc248f26e66227aef27c2d31f90b00d1b15718e6c46c

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