Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b569b31fc0ee32f…

MALICIOUS

PDF

84.6 KB Created: 2021-09-07 16:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a53b5834030460e6f915c78e1c58d086 SHA-1: fb1d4975be45b8dda9d254315d89a40167e59a28 SHA-256: 7b569b31fc0ee32f0e72a9c08ab17a54f3769cb5eccee73ed257c08487fa9b3c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://seanmore.com/userData/board/file/jaroli.pdf In PDF document text
    • http://myconnect-thailand.com/image/upload/File/tupunawigug.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210603_F32E4D650E12320F.pdfIn PDF document text
    • http://proxima-design.cz/files/file/1101292851.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/fugibalufepa.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/jibuno.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/monirikip.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5e0fbc7dc---75410278147.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081701b63b18---vutosef.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/tewuwisipuxewivoweburi.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/renorirosedu.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/94886917856.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210907170254_3wdj20.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/sekorixum.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/84064393696.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/serikog.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160f89c7cd3251---kagej.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zogibu.pdfIn PDF document text
    • http://flightshop.jp/images/blog//file/73761048101.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/69167093683.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ccf82c7fc36---38222252094.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/95628759231.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/14964878292.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/44431833539.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/12419753425.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/82970421931.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=interactive+pdf+download+for+androidPDF 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_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 18648 bytes
SHA-256: a2b7edb5fed33a69fb28497f09caeebdf11c8cb5a83e69881f1c191161e87b88
font_01_sfnt_off0001140d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1140D 10548 bytes
SHA-256: 6644b9e9dbff842c0380b4a271889e6c8c1875e74204ecffd188b3d96ae14d5a
font_02_sfnt_off00012c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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