Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4185ba27693bc7…

MALICIOUS

PDF

109.2 KB Created: 2021-07-17 18:09:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5582f9124cbfd5df521e3ec1096147c1 SHA-1: 4be9cc3af7c174222b9c0fbbf224531f3133d328 SHA-256: 0c4185ba27693bc7f31e58bd2ee18bffeddce15ad4a711b29fe052ef85d281ee
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised websites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JS and external links points to T1059.007 (JavaScript) and T1566.001 (Spearphishing Attachment) as the primary attack vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/9451fc15fabadfd4f66cc81479341657/gelavelavukoweredor.pdf In PDF document text
    • http://all-vehicle.net/js/upload/files/845921850.pdfIn PDF document text
    • http://theettiares.com/clients/f/f0/f03dfc1790708d0b03c48e9879ef2ea6/File/54269518125.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/kekivipewuta.pdfIn PDF document text
    • https://inncredel.com/uploads/voneziniwa.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/ferekevurijobe.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/dugefuta.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/30782531077.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f6e0dc628---gunobapazuboxupogo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/o7cbi1977oqbc9p5lgo3lon1s7/90824964064.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086b19c8e578---32983988102.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/3ccb0160389fee3954dff55c5eedaf3f/vaxekisuzeromesikoguxax.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/jatoxubopuredulaxijupewil.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/nusepekawemujo.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f8b0017a---konegojaze.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/dujavitozadaduve.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/vibuke.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/2819995640.pdfIn PDF document text
    • http://anupbolivia.com/images/files/tipigizewu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471ee0efd0---21251364321.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/i8l4ib2klojk4ujok4actkmre0/38565921093.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/tulapuloxif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+is+an+isoquant+linePDF 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_off00014408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14408 19508 bytes
SHA-256: 2e6b6103ceca849063b986e4c1b7d054345ad6a863891f4fec1c256105f31fb6
font_01_sfnt_off000176ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F04 10344 bytes
SHA-256: a608f869bb9b30c92e0b78feb3db51c01012fc46697b1298addfa63faae0bd3d

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