Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d358fecc66287a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 07:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 81ad3923c9802fe9083ef0f196f53c1c SHA-1: f2b3c45bf176298faf9373cdbda548612df1d574 SHA-256: 61d358fecc66287a3bff7e23873c92b1bde2270c0e9ef3011779a0d836686e02
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains numerous external URIs pointing to compromised WordPress upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and embedded links indicate it's likely used in a phishing campaign or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://coretry.ru/uplcv?utm_term=construction+health+and+safety+policy+pdf PDF link annotation
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084193a05f86---bafiwowes.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/rosudewupo.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/26267469017.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/af2omi43m45nru7mqm45tk1hel/tisosevapodojusomozowum.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/zekefenivezonikuj.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/8ff594a50d97523380736d1cc9827931/ligesije.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/oluccucq9hmmjj9o406bdjq1ur/liliwanurafudijewaxaros.pdfIn PDF document text
    • http://songiadahoaian.com/upload/ck/files/karuvenur.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/nogoxizu.pdfIn PDF document text
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/jogifo.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/90017061607.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/71dbfe909e60f3e769782c07e2397a06/jidulu.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/72ae7c9f0f5446965e751d6c51776b8e/sikidamolivefonev.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/139afa282c44f9f76a2323bac703f809/59950205450.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/bodixuge.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb8kgljih6kdidggg08p2tikr0/vasamofisaded.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b7d79c7fc3d86f7c65dfa799e88b0a9a/sodigiguwuritijepamutago.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/80251844378.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/getufum.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c76461e51d---mofavosadolowevumedupomub.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611b686ddb394---fugawunivure.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6d4aa70bd---39517908618.pdfIn PDF document text
    • 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_off0000c34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC34B 16316 bytes
SHA-256: 548adefcbca6313f77d672b368f3ff3e7a6cb918a046561d4ae387b3af4470d9
font_01_sfnt_off0000edab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 10960 bytes
SHA-256: cfdcc1af4658c9ac7477ff541d80f428bf915f32885bc0abbce5acbb949f3070
font_02_sfnt_off00010718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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