Malicious PDF — malware analysis report

Static analysis result for SHA-256 277f65f6baccdadc…

MALICIOUS

PDF

80.7 KB Created: 2021-09-02 16:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ba0b7c29f862bf69ee62b458f83e363b SHA-1: f4f609abc743cebcff0dcbbbbcff5c3e177d1823 SHA-256: 277f65f6baccdadca898b928a512ea9cdfd28be10cdaa971648856145f65ca00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, preventing analysis of its specific lure, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://pixomot.ru/uplcv?utm_term=improper+integrals+solved+problems+pdf PDF link annotation
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/c2d23511da69bf5c8670b68488509693/govunevug.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/0miuf3p0lnj5kgu52heorldull/76276240841.pdfIn PDF document text
    • http://asfalon.com/__files/file/86945435775.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/c54b5eb04f751c9fb21d8fe91db5e09d/18292344054.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16114bd7d6ec82---69745341634.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/wazuwazerev.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/85d8aa5609719a1402cd3db1548ec34c/89462744965.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/donitasobopegumabudepe.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2c19cb28b---nusilelilonapawevuluze.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/vadivizikofudufudunekaris.pdfIn PDF document text
    • http://jewelry-shopping-city.com/uploads/files/202108302144265377.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/dedagodibifavugorimunu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eb6c271a8ce5af16b7f764fcc12b3f1d/wizis.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/62782466757.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161235380a67a9---17794091863.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/jesavadokilati.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/6d659e9e7a1517be0c2142055af5f641/61566417569.pdfIn PDF document text
    • https://kebecelectrique.com/upload/editor/file/44749924984.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/9bd1eca6bb361466e6271bbfaa8b1630/66147060041.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2990d3d1---jewumag.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/nelalak.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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED10 18140 bytes
SHA-256: 394c8fe5be4a1e1bb0611f8ab1629b7427f91cc6d7cbf7cacb6ce90eb1babab8
font_02_sfnt_off00011bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD0 10996 bytes
SHA-256: 85920321d2087db0c3cd6580104b9d4cfa7b2d86a5beecfcd2f05b157f6ced6f

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