Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bf91b4900b3c36…

MALICIOUS

PDF

86.9 KB Created: 2021-09-17 22:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4e6de1c131ea5a72d71293f249c51df SHA-1: 4b56b7401bfbe9741808e71400991532c2204b2a SHA-256: 86bf91b4900b3c36ca10e94d9dc127f2b36428bcfbc4ba744bc211ff8848070f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=itachi+novel+read+online PDF link annotation
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ce30de94e---tewafisatasevolasazet.pdfIn PDF document text
    • http://etkenkalip.com/files/fevata.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/puvelujapimox.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/voluluwidededokifitake.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/68949127814.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/wakeloz.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/kutonavizasidibejex.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/lapunib.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/22545846536.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/pebulobakusinujo.pdfIn PDF document text
    • https://granitnet.hu/editor_up/gijipa.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301383dc83f---toruletadaremi.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbe6df51f---78670515002.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/79634375840.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/uqjio8q6sukafs61fe22vausq4/dubasanunavumigu.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378e388a2f8---59117674639.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/68621221587.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/50751855844.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210918001929_226924092.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/vehim4pjs04n659g7jrgobp8ed/81721659064.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/50168107318.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/8740485686.pdfIn PDF document text
    • http://mebco.ru/images/file/vikaleva.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/0f923e09f93542964de086d720b5d890/67734863413.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_off0000e923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE923 10316 bytes
SHA-256: 79ac940c70b30a7a254402b1cd0e3eead3df71e189d0dca0ec17db3512cdcab6
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001186c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1186C 20688 bytes
SHA-256: 8285cb4b9d2c478fffd3db873fbef40c620852e6b4a0a68a1e41bf8340bfb2f3

Open this report in the interactive analyzer, or submit your own file for analysis.