Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e40dbd024777465…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 21:49:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 906e900bc6a1a0738671a2c9ccf2d6e8 SHA-1: 462480138dcfcf0d450303e6f2c58d35efaf904e SHA-256: 8e40dbd024777465de8fa50c29edbf80931be372e8d5d2abb7e89bd413460e2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://philabc.ru/uplcv?utm_term=taegutec+inserts+catalogue+pdf PDF link annotation
    • http://photou.cc//ckfinder/userfiles/files/5917239392.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2644f84a31807108839d613d1d279780/99648976259.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b954585c1---nutelanunefuzoxazepe.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/jurame.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/vg90pel067pf14oknp9h1ct9uu/90332658629.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c5e8e23e6---24723797699.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855079c8b94---rususuf.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c0642cddf97---78070303661.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074215755edf---pivupitubeb.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/fetufofiduza.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/lijanepu.pdfIn PDF document text
    • https://bamor.org/userfiles/file/74452224067.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/maxupozuzijakeradisepi.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdaf1ce9c9---nejorav.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4afa88c2573864864e00f3b4cb6e17a/2817808290.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/turapef.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/dcpk5rhp463s609sa3vajsl5ut/58713247398.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/6858171984.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/31594845813.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/wibexilemixu.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d02b8a047d5---lefodiwubibubepafomu.pdfIn PDF document text
    • https://paperland.bg/uploads/file/20461370871.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/83255147257.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d669a1720e7---kavofikigux.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_off0000cd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD81 17720 bytes
SHA-256: eee22ca64c9946352cac815556d05d1fdc4814eff5dc61c4c027490d113ce5cf
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11372 10860 bytes
SHA-256: 8fd81d65db041438a5bcbdf2bc2d5fb49f503eee0d4135a8fbac231acf227bdb