Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f054821a313873…

MALICIOUS

PDF

94.4 KB Created: 2021-07-02 15:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 766e8dc36389423b5ac689fab7e1c2d8 SHA-1: c24ab6a96fd13f4f4ac88f04e6615807e1941747 SHA-256: a6f054821a313873e7d9fc5f8ce238e9a9d5d102f08d8f2b9b50a03977e7763d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable domains. The embedded document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting the primary purpose is to host these malicious links rather than convey user-readable content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://wastran.ru/uplcv?utm_term=what+is+a+queerplatonic+relationship+like PDF link annotation
    • http://vtaky.sk/media/file/fudapusekamubadotuxegep.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/87q4vappcklp6635ive10ht4hl/kuzuduvobem.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160cfeed73f637---tupupukagadaz.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086d9be95cd4---56676268001.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210507040016_2071023708.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/e594222cbdb9a84140f7e747f3c944fc/zowowijuwekobur.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/muninililak.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/sozuz.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6e2260e254fb7d9d7119c9352a8bfee3/66410074641.pdfIn PDF document text
    • http://vattucongtrinh.com/userfiles/file/55369013672.pdfIn PDF document text
    • https://angkalaris.com/contents//files/purozadutubupul.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16200328797627.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b93c67495---72615692700.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/atlefjl3ccc30j60jd05jrkuv5/25872086551.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d1c90ef624434f6610959721755cc1f7/wotezuxagifotamiwumosa.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/vupuwarenatabeve.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607be33fcd243---wukipapunewuxozafezole.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fc53a1c9e---pasiguminofeti.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607756cbc8acd---68038570584.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/4e832d5f4774f952a0757646bbcccad0/64216469648.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/7qalu5npreqjqcimegl2fsosbk/90409839762.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c328bb8a45---50111208961.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/juzugivolavaxevuwozegidov.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adf7273ec20---duralujanexujenizapum.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/4942df70bf0c35f82e19c711be0a7359/mizazumupofokerobisi.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_off00010e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E15 10804 bytes
SHA-256: b09c604c2ff10188e0045051ae560f991c39f9f4acad4db535ceca6ea9e6125a
font_01_sfnt_off000126ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126EA 17296 bytes
SHA-256: 479f653e9ce59248affc1db0ccb16aed37be88319c191135e07e03946f8ea904
font_02_sfnt_off000153a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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