Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc4b8b4d4988a02a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-04 15:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 61b3cbf76205e45d55af433596c1a1e0 SHA-1: 779aa6d34714a2971125b54b30e379590ae746a0 SHA-256: bc4b8b4d4988a02ab50cbf562dbabddb6057749fa0ed45953e655d0446f186a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to malicious content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f253795ab---77892955097.pdf In PDF document text
    • https://art-gallery.mn/uploads/files/84661286589.pdfIn PDF document text
    • https://manenshop.com/upload/files/57086895635.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/d45b3ef5e5d69801fb5f8cc5d2fd610d/12828517553.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a47d4bd5cd---meguganolatoximex.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcc10b79e7---xafat.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/4825704794.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/c1c9051ce2bd02324a05d8805c892905/70696291867.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/savopurijulo.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/43281943545.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/ferugerume.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fb1666aae---72770416703.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161255721cc1d8---62849915951.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741531bde7a---71042443353.pdfIn PDF document text
    • https://nakshistudio.com/ckfinder/userfiles/files/dagemap.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/f1b8c6ae1f8e20eb494a92532bb98fa3/voderusi.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b528e8efd1c---56869235019.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/82264563543.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/63955248931.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/68540283902.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/vasudi.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c90917bb4e5---39041334098.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/sakujikirevu.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/b28f9965c2fc76584ba95969f178d22e/sededasipupakazusaru.pdfIn PDF document text
    • http://menafundinfo.com/userfiles/file/pemalujisakefodumatisoku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=remington+hair+straightener+wet+2+straight+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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 10908 bytes
SHA-256: f4a8dc8e310397a5cd750f3616e6700e8753df0cf0f8e0cbf3dd1a8ced493806
font_02_sfnt_off00011048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 18524 bytes
SHA-256: 65d709559bda11f237a6d97681fe73a3964961f1f0d83a463a5c29f038cf60bc

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