Malicious PDF — malware analysis report

Static analysis result for SHA-256 839265c5297c9908…

MALICIOUS

PDF

83.3 KB Created: 2021-08-29 07:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17946e172a67f740dc71b779b94c5f21 SHA-1: 8d3fe3b02146e2c02411edfacfba6207da6f0c8a SHA-256: 839265c5297c9908f15ac3990b6b5c0f64a668e368dc873096df2126f1bbbb1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple URLs pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b69d6c695---sefezinubididiju.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/j6pmr053q013k4i14d5u8o2u22/36520024669.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d5b84d941---43131462644.pdf
    • http://www.cddfct.com/up_files/file/8058619666.pdf
    • http://motoren-adachi.com/js/upload/files/17507713416.pdf
    • http://aktifimmo.lu/userfiles/files/rawugoj.pdf
    • https://kaptenhoki.net/contents//files/94640880222.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607826a555638---lugeke.pdf
    • http://wisdomtours.net/upload/file/13185084476.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/cidci1kcqjeflnvsmkg5unu347/fopominidedunomuto.pdf
    • http://mdsalon.ru/img/lib/file/nomogujufizomazuga.pdf
    • http://hockeydh.com/files/ups/files/ruvuseluz.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/83d6290f4723e1fe564233722f4e3d81/pefexafure.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c6ebd8fe6---50199656182.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/mnf1v54f6k09g78edvruurorm5/61128647187.pdf
    • https://interference.ajoda.eu/userfiles/files/22984309049.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b188ed8477---72241791730.pdf
    • http://topstec.com/d/files/61391986990.pdf
    • http://csc0851.com/userfiles/file/20210806121939_sjlzab.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1f75e1a3---41201730814.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb281e4879---wolarabagij.pdf
    • http://zgkimsteszew.pl/img/upload/files/mawagaliseludajakuj.pdf
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/b4dbf412e267dce569ec169d5993d4a6/87613633112.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe282c0631---kavegakixadikexu.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161059b38b6912---90728817170.pdf
    • http://bainihu.com/upfiles/editor/files/tozedoxapalasowonafe.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=nutrients+in+a+ham+and+cheese+sandwich
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc68.bin
dfd572c0ed9b420e9fa4a5c88916ab6c6026bca1a8e2bafbc57199c91bab18e4
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC68 10632 bytes
font_01_sfnt_off0000f495.bin
73f0ab288bc55098dc817895a29bab795e2bc32d6db3ce365f7180d03456c6dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xF495 18996 bytes
font_02_sfnt_off00012634.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 16792 bytes