Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ae5bed98828c54…

MALICIOUS

PDF

88.7 KB Created: 2021-09-08 04:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a400003c527d53fbdadf816e4f54b80e SHA-1: fe5b2e28315995c327f57f794cb4eb1cdeb6480b SHA-256: b8ae5bed98828c54e2a9b527b51c049b93390c7a01537956fe3a5ab024776894
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded URLs and link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5191

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=hypnotism+techniques+in+tamil+pdf PDF link annotation
    • https://gachbinhduong.com/upload/file/bewiduramugadozanilif.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/3850236966.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/44307833425.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/91121656724.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/45138859340.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/87363050490.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/jetumowidepirepaloni.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/35125946884.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/58186030749.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/66322200713.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/verevowilejigufadefo.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73b817f8e---22359524850.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/7992889745.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/44729645405.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/6a3342ad51d6be96b7ecd5961a852289/85872324306.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/14f110b003f1bf10d79a140018c233cc/80216674491.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b473f7e8cc1---78501940465.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/99672532316.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc7990ecaa---pefise.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/pexiwerufanes.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/p765054bfl9fnohgkcafet6cvf/20063850844.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/tenofilupuwavanisonumaw.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/50774974157.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6f7a780d5---55268315656.pdfIn 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_off0000fea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 19328 bytes
SHA-256: 3b4802fba0528ee79f8b33cf72a5e5f8df710a6f0f063bc30a6e837372c52d63
font_02_sfnt_off000148e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E8 11136 bytes
SHA-256: aeed0cab30af4e68d7720f9d7ae2598802cca6aaaff0679a480b3dedb77ab5e4

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