Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4bd59902e669bde…

MALICIOUS

PDF

93.0 KB Created: 2021-07-30 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 29b010a7faedb123bf103710b897baa7 SHA-1: 3e51774e89c76a189d3b34d3f6aa64dba123973c SHA-256: e4bd59902e669bdec02ea87a92d1a08c25d21e7b236f10c30f7910294ed75769
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of the links and the ML classification indicate a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9866

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://queure.ru/uplcv?utm_term=official+letter+writing+format+in+english+pdf PDF link annotation
    • http://mav-auto.ru/images/file/72868655293.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/c4864134b9b4216ae775306f1fdf52b6/tomonidizuroxuro.pdfIn PDF document text
    • https://banghenails.com/upload/file/92906822403.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/47833127764.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aae3b0179a4---jijeda.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fuvifuxisudotuvap.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d1b71d03a---pojapenobukaguk.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d91b485c---79388906401.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/jikamevu.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c29e847a2b---15774030406.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16074723b6d92c---totujategiperulefusosupol.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/riwuzexunojupat.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/0b24e3946e2013e79a48938dd6bc387b/narajir.pdfIn PDF document text
    • http://akademibt.com/resimler/files/6244293740.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080130e4e4cc---namogosesenatezunosodobi.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/dalefumovojezipebizup.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/6it0c75vvqbnjv1780c1sm3js5/gozebojasepopadoloje.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/rabenorameresiwaserug.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/legagunuxazafujemeliba.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/5153059090.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e2de0e221eb---52188594647.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d44d4c13a07---78633858783.pdfIn PDF document text
    • http://artospace.com/pics/file/bepobafut.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160797e71a40af---15307758221.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/20849118079.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/xogivojoreduduvalu.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/89165201272.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_off00010753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10753 16620 bytes
SHA-256: 3a7d923eaad3a62bf9dd2ee55f0fb2b00e2fcad548a60c85c37bb03a2ce01cd5
font_01_sfnt_off00013272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13272 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A89 11180 bytes
SHA-256: 9b3e674d451bf11260b54fc277fb251a47bc5801c1fff31290da684ead2d1ea7

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