Malicious PDF — malware analysis report

Static analysis result for SHA-256 29897213c6be32d1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-16 19:44:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4154a6d2aab1d97371a76bb2e81931f1 SHA-1: d156584cf6e10a4aeb7c7541d34a0b834d52be14 SHA-256: 29897213c6be32d13185bf44ecea3a715598a39f26da889a15281df3a0015c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as compromised CMS uploads or part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=injustice+ppsspp+highly+compressed PDF link annotation
    • https://chiataiec.com/userfiles/Proj_Name/files/tivetomasaloforisoravowa.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137308f7ad4a---wavagizaxuji.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/jifutitek.pdfIn PDF document text
    • http://saydersan.com/firma/files/82951558572.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/nokiwipep.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/33896618611.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/46433303590.pdfIn PDF document text
    • https://jjpremiers.com/files/felusas.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/73b8f7d32e672c507279c6967bfbac2b/tudebi.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/4227326671.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d00314b613---92918912617.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/8581793227.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/tikadix.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/np7b3108slnn4iv1vkc2sgckqc/sarano.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/93445578090.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d853bc4b5e---saxiwubakibabafevubu.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/68643089699.pdfIn PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/wezigagosi.pdfIn PDF document text
    • http://ideviceplus.nl/app/webroot/files/userfiles/files/wotogosorukesatibil.pdfIn PDF document text
    • https://amgaa.org/temp/files/suvowusuxozokezazobaxijuf.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/81580023979.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/76636713334.pdfIn PDF document text
    • http://rilta.net/userfiles/files/45149743298.pdfIn PDF document text
    • https://ruh-center.ru/userfiles/file/60931491553.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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 11096 bytes
SHA-256: e3ebf868f8d21403a9a53a4c8794e7f51f5b2b56c93557d585764944358b019c
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 18736 bytes
SHA-256: ad82dd05509f3ea8a1991e2b2cfa5215ad74db2002eb1938c820617c34d1bbe1
font_02_sfnt_off00012d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1