Malicious PDF — malware analysis report

Static analysis result for SHA-256 635db12f605f71ee…

MALICIOUS

PDF

80.8 KB Created: 2021-09-02 16:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 560d49f1f64c53f1a4a1ac32c5c243ef SHA-1: c6fe0202e1c21fc88dfba2c0465e5d21658bf1db SHA-256: 635db12f605f71eef4e4fa8e3607710fd95b006fef384a73ceecd90ee8234f05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, hosting numerous URLs on compromised WordPress sites and disposable domains, likely to redirect users to malicious content. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=service+termination+letter+pdf PDF link annotation
    • https://alihuata.com/userfiles/file/gojuf.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/41842714617.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe8db773d9---29985125452.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/lowasijuroxekewawufoj.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/37767889215.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609be6db9d6a7---towaz.pdfIn PDF document text
    • https://jasz-pap.hu/UserFiles/file/19062327192.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/694abd0bbf7103603e68689f6bf2079e/zevazipenobufawibidas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125a038f0252---35655039057.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b313c10f---nepedofubivi.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/b532ded43b9e1d4a83cf30d46abe88c3/kuvemede.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/27290898169.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/67405950400.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/83a29226d01fc4c264df3ddd4bfaf931/73488042239.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/76942497534.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f699fa9dbe---31659080511.pdfIn PDF document text
    • https://noddy.nu/images/file/13483577281.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/5540f4632631c71a82ef3b01cbaf8e72/zikoratudu.pdfIn PDF document text
    • https://smaransaving.com.np/ckfinder/userfiles/files/wewunopolosot.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123639e2213a---mokavefuxukulakizuxoker.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/dusukowubex.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081123341301---pireferavuvut.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/868ab060ead24f8d2d13c3400202a64b/74181476158.pdfIn PDF document text
    • http://sjanzee.nl/file/gokodojodozusiruxipigufe.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085bce8f28f5---8405127539.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_off0000d75f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75F 18184 bytes
SHA-256: ffb9fefc1853f56f6f63b40862665836de75b9a8a29b3de1a5716f28cb6f8b3e
font_01_sfnt_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD8 10752 bytes
SHA-256: 62d23111b935eb68c0af9c4e29143dae5bc4b28c0fa88744096b970223a7cd16

Open this report in the interactive analyzer, or submit your own file for analysis.