Malicious PDF — malware analysis report

Static analysis result for SHA-256 7940199391092c6e…

MALICIOUS

PDF

86.5 KB Created: 2021-06-29 22:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1bb985af511f83ed64f0518e39467bbe SHA-1: 2ed2154df57458cd9ee8272093950d07ff6cc473 SHA-256: 7940199391092c6ec38344dfe77a65b787f2c0a683f6da15e5f4a969c17f82e1
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 sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074b14a7806d---15472826564.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/85b679a181e38e826cbaf90d2d118bad/xopaselunazurugifose.pdf
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a646ff42cb7---mewaguzetikedilaxema.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/691a9ed867ac74021cf71792146a1bd2/sevazatoladojosis.pdf
    • https://123natura.com/stockages/files/3083218913.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608816c091321---40644307180.pdf
    • https://qqhanoman.com/contents//files/midaludojujero.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/5b7cbba9563a0e3eb073f3b361bd8347/tazelirulolovewub.pdf
    • https://travelsafeway.com/userfiles/file/zijowoxuxejirasetatubigi.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796f6f7cbd4---bogavoneretesosizib.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bcd4749bc---79601737682.pdf
    • http://glotecgh.com/upload/editor/file/javopafololozu.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160833a9eb5661---mibevarubitexolafada.pdf
    • https://jjcfurnituremaker.com/userfiles/files/riwidizaparafesixodipukut.pdf
    • http://painttechvina.com/webroot/img/files/mumurobudazuxol.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7d7c4395a44ac5cde9b8b4a67a790022/jomawefotaw.pdf
    • http://kbo.pl/ckfinder/userfiles/files/83935722006.pdf
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/d16d05795472a39a9c032570fe99d8bb/xajanapi.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099966bdc792---76464118747.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f196d34e58---17116181244.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904dd4639f1---49910016925.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=signature+home+health+federal+way
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed63.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 16792 bytes
font_01_sfnt_off0001057a.bin
abe33e93191b7dc72b32b8c9ddca07a815298f6c8f8e23f892def4be30f15b72
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 11008 bytes
font_02_sfnt_off00011ebb.bin
14634d13d7319d8e9206d90c66be21ad8c0c01baee70783a9bf5bb51d59ddb15
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBB 17652 bytes