Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46f5b8e33034cd2…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 03:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a7c4c3b154ad62fcb192fd7f3cdf6404 SHA-1: 20de0f5eae6c05678d27bd5373526a6525153acd SHA-256: b46f5b8e33034cd2c5bfc600b3c42fa2fcc374bdff985ea8b109e8456436a1a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

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 many URLs pointing to potentially compromised websites or disposable hosting. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://ip-golubev.ru/ckfinder/userfiles/files/47028001410.pdf In PDF document text
    • https://polaria.cz/images/file/vixidovikomuno.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/noduzebujujuveli.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/pixizobigu.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bba76bae203---vanulafopab.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/luzapasemutok.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747f0518a11---96606212310.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/ximuriz.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/bapasiduloxeboxefat.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/sibodazeji.pdfIn PDF document text
    • https://kermanrooz.com/img/files/53058985112.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/bapagaretit.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3bc2dbd7---wezixepibi.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021514543587882.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/0767781a4bf66ace24e61be0545c09f2/69890289316.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/73766578625.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb64de0a1de---12180406058.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/padegeno.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26de6337d9---xakisatulisosixe.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/44772923437.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/efeb2504b61e6c83ee2855e1211542c1/29593281858.pdfIn PDF document text
    • http://techbis.pl/files/file/zavuruzifopomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=diversitech+cp-22+manualPDF link annotation
    • 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_off0000ca39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA39 10840 bytes
SHA-256: 4d41456c8baf4a0d86a2b51733571e46373611ca297f0d1ddb4e89a07af8cb22
font_01_sfnt_off0000e332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE332 18112 bytes
SHA-256: c6c9e2715222a522bdaca9e5921c10750f0f5154ff8d4536a6a35dc1ce52292c
font_02_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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