Malicious PDF — malware analysis report

Static analysis result for SHA-256 60031d4e0118a4c2…

MALICIOUS

PDF

73.8 KB Created: 2021-09-16 05:27:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d7152d39e155a7b2a88bef76aacda37 SHA-1: be9c756548d445c71f6d1a2f276d1319fedd6622 SHA-256: 60031d4e0118a4c25456ac7fde05eaa760bb10847eb23fe9c7aac5a7ce00b16e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites and link farms, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=gangster+town+mod+apk PDF link annotation
    • https://m-isc.com/userfiles/file/jizaxuxi.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/8773466719.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/52889957921.pdfIn PDF document text
    • http://word.mn/uploads/assets/30569289336.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/73511248475.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16139f4da6f01e---jewamemutijunolirotebixi.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/sapajafa.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/sinofedijogipat.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/fanolefusiminipozupavupu.pdfIn PDF document text
    • http://moretonassets.net/userfiles/rovukimizigidolanisevifa.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/85207393596.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd0c8c23d2---26996540965.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n95296mug3lfaaevp0mstmd0m6/20043366654.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/87648326710.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/23272922776.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/94901353699.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/tusuresifurulesako.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/95037480762.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/nanasuzobowogeporivip.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/57818546359.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/94047315757.pdfIn PDF document text
    • https://keongracun.org/contents/files/11145624444.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/futogojifozatajomup.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/nazakikike.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_off0000bc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B1 10816 bytes
SHA-256: 469f3892dd865188e4f894b9f82862d0594919242ebbc5b0265625bc714fa15e
font_02_sfnt_off0000ed87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 17052 bytes
SHA-256: 4800e5ec4d16761a03b27c21ad7defea900326d540653f28b603652e816817f8