Malicious PDF — malware analysis report

Static analysis result for SHA-256 09fb50b6146290ce…

MALICIOUS

PDF

80.3 KB Created: 2021-06-26 14:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 6ea32c22e020eeb82eb32757cf2ecce0 SHA-1: 663d7bedf706068ad160a737e6f7d42302bc5258 SHA-256: 09fb50b6146290ce0c410a3dec976864301692ea18a22c79ad78e4f7ef3225ce
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for hosting PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The file's structure as a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=horse+games+unblocked PDF link annotation
    • http://servis-hradec.cz/files/file/rozimozulizozasupazuvan.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/51d1eace0d0a0a6787425d425d5777c4/pojori.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c661fd5e29368e8f5c7d5dd2c00d9a84/zakopipemaf.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b06006460f3---38284312698.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/a3btprurfoll80fmmp3c7basq5/96347293631.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608476592ae27---tafuzezimajukijonube.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160748c324835d---71970680587.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ef1acdd62---pivuxo.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/kuwufu.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/58396028953.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bb252a280---64246617659.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/tepumazutav.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d13rln0snqno0090bk3bccoas0/93468132857.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/josubak.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tiegnbjssijpm7f2ddtisqnben/gazuvusufugip.pdfIn PDF document text
    • http://berbun.com/user_img/file/31985496969.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/ecd9dcb23b6531cd3663dea4965c4687/37080118669.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/mewarufojuvuxi.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/21821275698.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160775c72adbb1---93058365462.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/manaxajunumudog.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff14e629df---44439379808.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/wokikuzusaxedamimowi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/abc85d8505a52a9150585383e9d698da/7091398389.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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 10844 bytes
SHA-256: 441538e51725ec09738abcd64a4ca6b272f39c41e85046e76d534a8a34dad8f9
font_01_sfnt_off0000efc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC3 16540 bytes
SHA-256: e35fed6a78be4a7b96552e3ebd3c262d8fa0da8baefc8959a1c4f225f3e38d6c
font_02_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1