Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1b68db265a32b36…

MALICIOUS

PDF

86.9 KB Created: 2021-07-05 15:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83ec4c12bf4bc686baedfd6ef7ac8561 SHA-1: 90ee091c7fc90595e5079629f30303f2c591bd3b SHA-256: f1b68db265a32b360954fb02645c1e5e87b9270ce6ed8c5dc53cb6f23e9cf8db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://sunfitclub.ru/app/webroot/js/ckfinder/userfiles/files/vegopuvepizoguti.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/d047bb30a6c9e163fcdb2a9ebf58b4b8/83560189501.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088bfad0bc5f---dixadumofetixatemisa.pdf
    • http://joewhitefamilysite.com/clients/59967/File/lurodekitovunenele.pdf
    • https://thietkevuphong.com/uploads/image/files/36075554320.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160dc70618c863---24767578221.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c375fee1---kowidog.pdf
    • https://alexandrapanayotou.com/web/images/static/file/27722915966.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/q7sa33etmtaukebnmcgp4m79o5/93118777416.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/48sbioli8k18024qgh4aa5fkr1/73023650205.pdf
    • http://kibbkw.com/uploads/file/11264104052.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/369979d3b55482167a36f23ebbe40fd1/rolelevevivob.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac37254d0c8---16060786494.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16086f4ccd70a2---23954705866.pdf
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9a8da0d0---bulanuxedejifoleta.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf81b4bab4---nasanesebajivaded.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b9362d964---dokaki.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8a4e2a60c---68750445313.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/ded23b1eb576664da011abc7c70f57ad/49235514323.pdf
    • http://wowbond.com/upload/Fckeditor/file/jifuzozona.pdf
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/04b206fa7b8a57d1ee36fb846c453b83/dosesujemav.pdf
    • http://maroba-zirndorf.de/file/16344016697.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/mrj90b5mdr2606ornnnfe1igmv/48006217668.pdf
    • http://hibertek.com/image/files/20210623_085539.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16070ed28aee52---tegumamatoxati.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+answer+who+am+i
    • 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_off0000f21a.bin
98beccad44532a71962cbde53a906eb33b8e7d27e5daff833a0f0d35532a78de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16676 bytes
font_01_sfnt_off00011d76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D76 16792 bytes
font_02_sfnt_off0001358d.bin
ed813c8fbf92b9c124bf22105357175790f818c6daca58c31b0833bc30ae0db5
pdf-font-stream PDF embedded font (sfnt) at offset 0x1358D 10404 bytes