Malicious PDF — malware analysis report

Static analysis result for SHA-256 829a6c7992306a0e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 15:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 455e5082797777a49da966d823a44923 SHA-1: e2ec0eb776eee0ad05b9a02beb5d1c1247612d45 SHA-256: 829a6c7992306a0e999bbba838bb8a09e549ffddd1c1e56688364deb9eeb1b31
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=planets+worksheet+grade+2 PDF link annotation
    • http://esangsok.com/upfile/files/89637947037.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zagif.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3496c969c8---bunilatelajarisuwepepa.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/bilisagixevinagibimep.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a2bfbaed1---dubonosigepopix.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d080a7fe99---nobomojikujeduzifojarata.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611311189b136---42472346887.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/kepitu.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/7l14sq871aomlv6rva7dua2ah7/zexajosuxadaxox.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/4df7bed70feef29d28f689010e277e43/52213203316.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/31695652167.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1612525f795ad3---ramaguganopasisetuwezoruv.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/xerasipejirakafebeni.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/pebonewodelisomuv.pdfIn PDF document text
    • http://gotween.com/userfiles/file///vogujejadibekotuxojusa.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1610ee36b9064c---sixot.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160843d8701b0c---vubaniw.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/zesuturoratupa.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/3hb93rai8ls4ii66kctdq8eb4c/bozuxexareko.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/63065095094.pdfIn PDF document text
    • https://mfdesign.hu/files/file/79078533742.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/78079166157.pdfIn PDF document text
    • http://amandamaitland.com/images/file/sazaf.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfd44bdfd74---38172985598.pdfIn PDF document text
    • http://badgerhillfarm.uk/69989098241.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/kazebegobigaraxib.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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF256 10732 bytes
SHA-256: 482f588782fd02858b4415b78a4b6192c2b08b5b1a4e22eb3fed530b23514052
font_02_sfnt_off00010aec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEC 16968 bytes
SHA-256: 763cb8e498ee1a5f129d3098d7b8aebf4b6c016c447d531311e8a25836e94820

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