Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa03474a11f4e56…

MALICIOUS

PDF

71.6 KB Created: 2021-05-07 00:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b6a82b3176324284a3aa05d7fbf943a SHA-1: 466c2cd1822f021785d6bd6954ff37daff1780b6 SHA-256: 3fa03474a11f4e5667664a843fc9a40d16827c55ae30add5585b0d09ea7a3086
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body, though heavily obfuscated, contains references to 'dark web sites', aligning with the link farm heuristic.

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 http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160816b3188256---70419845408.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/f33c74391aa7510975150d9087e23f74/riwariseto.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/35k7p1kt3ic3v5m1v6if1tcf62/3999735672.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c948f9eb1c---15760263170.pdf
    • http://airconbank.com/upload/fckeditor/file/37448160514.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6a5cqoaaf4un695lgfrfpidlq5/vulenewogorasa.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/dd201cf8a686327f38aa859e73bd1cd3/rawenefusi.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa07f19d2d---vebes.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/t26m9m4rpk7m7fju5uaao2a11s/tibowatakokotonumoxajujar.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757e06d9cd0---14646666936.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/oium8r3vggftjho2jivkk1smk3/muvatupawepodap.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8396d2ac---mulamigoganafetexizatol.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/68fea62c643e9fa02632cf71fd29045f/28945854104.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160896ba891401---jukaronakurufenojufe.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebdc01ddb0---99850118658.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/brfud7na3vg677bseeds22dj22/fulibejixemugetabatolu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=dark+web++sites
    • 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_off0000dd15.bin
0915b06d303031d7cf1b7dc6f3be24bb9994f430aa523ca60f1bf36e794123bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD15 4944 bytes
font_01_sfnt_off0000ee0c.bin
a7b77fc6e2583dd92a925417d317de83778a8f6207448823bf8edf7647c1a6d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 10560 bytes

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