Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c7da330c020d82c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 00:20:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0939943b493b9ab1d47b49e151c518b8 SHA-1: dc1a2553abbe347d18226527abeed00a8a0bf69c SHA-256: 0c7da330c020d82c28cb9e8b3dde1e6b8845d67ca360ba47a14c5cd5913d01fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kommunikator.nu/demo/userfiles/file///85728923449.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/benazavafowor.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/labej.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe15c947d---lirapuwikapibeni.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-8///2021831349452433.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/dukukofuxunoma.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/857839cb6bdce39cf3a0f9df4331f24d/95284158369.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/worupeletezabapavej.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/18b970238a5f4ca0a79201756641a1bf/56204643487.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c82f9b642---34454546589.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e65ee019c6490dcb6edb27d57a6633a3/felavefujezoxezuliwe.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/kiravotalaxipesig.pdfIn PDF document text
    • http://texmet.pl/userimages/file/xuxapiludatisobivoj.pdfIn PDF document text
    • https://ls-machinery.com/uploadpic/files/202108171205423438.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/41293181903.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b13040cd223---neziseda.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16083099f8fd0b---37572346867.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/7b548152c33d5162ff7617846264560c/manavefivoduvasa.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/matumaxixevoso.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/nojejuzitufurapamo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bafb73366---83510228434.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/e4d87e39187d52ad727054499b40c787/8037211376.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/38973095870.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/j5so74k0kfg5t1f0qn780bpfs2/1550086208.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=overall+heat+transfer+coefficient+pdfPDF 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_off0000b865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB865 10808 bytes
SHA-256: d951ac5c11e9d27386d798c4539d0abfc90336fcc33a63c5a84ea1429835c69f
font_01_sfnt_off0000d14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95E 17464 bytes
SHA-256: 8751c5b3215c218fc35611b7e19ff14cbdb05c6548e7ed71171e137fd6251281

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