Malicious PDF — malware analysis report

Static analysis result for SHA-256 904470bfcc42b018…

MALICIOUS

PDF

76.5 KB Created: 2021-06-18 17:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 967ce1e693149e99666b505f92ab9434 SHA-1: d991c67226b8002aff580f40d1f0bf6772093398 SHA-256: 904470bfcc42b0184c4ebcbcc3087c2a1d164957eb8393398462079178d389be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing form plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/d35e7d96a2999b35e389c8c6f6ffbba2/92451197172.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/9fc4badb2ec0246f0067339fd314c032/49965055275.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/09ba0556e221c784453e6e8f3ca4313d/28783298701.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/29531006751.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad65b6b719d---26573108861.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099193c1e6c7---fakajebekositexuwinotujil.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/f7ebc3fdd40b213f5e2c38e94dfc52ab/62030716092.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ae398c0fa---purejuzugajix.pdf
    • http://dailygiasi.com/uploads/userfiles/file/77538541527.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbfc3210bb1---84942051697.pdf
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sisixigijanujulivuzunu.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3d739fa8.pdf
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/etvgbcbmhd0kbbi24idslpe0k6/wabizif.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/3b972e25d3730eab24f1d43cd82496f5/safebetovarati.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/gaoko1nas991h5133unfmblbf0/11747257152.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=weekly+goal+setting+worksheet
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb29.bin
baf77c20bdac607e3945a22824d9f2888c4c9a56e504c58685ce2d7c4991aa77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 5216 bytes
font_01_sfnt_off0000fd08.bin
2cfb0ea5fc616735a5910d8f84f2aea6ecc72b02fb39f73387d5c8ae552b7471		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 11444 bytes

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