Malicious PDF — malware analysis report

Static analysis result for SHA-256 46335b7ca7acad54…

MALICIOUS

PDF

88.6 KB Created: 2021-08-10 17:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbf5a674a3d7b2e4d557e461f4971e86 SHA-1: 7730c2f102eb4b754bea51b0b35e068f18d9d6d9 SHA-256: 46335b7ca7acad54598b3f4389c3315973480b027b3ac422393b121a92919c2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=how+to+make+a+funeral+program+template
    • https://espiber.cl/images/uploadedimages/file/savanifekuk.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d78a756f78---kaxiliwozajenije.pdf
    • http://tremonttemplemacon.com/clients/862779/File/burokiwa.pdf
    • http://schokozentrale.de/idata/73186464492.pdf
    • http://a-pluset.com/userfiles/20042792403.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/b70a958a05d83f073c4b3eaf9838ff03/10272628724.pdf
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/67331547828.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c257d4a215---molakunigusakivojoliterir.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/02bfd7167e9f7237898e0e6b684bac28/93379020178.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbb437bd43---suxubosudolukij.pdf
    • http://szybkieprawko.pl/szybkieprawko.pl/user/admin/fck//file/rumavu.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/emg1fgq3uu2dj4rj0ohtujvcnr/765814221.pdf
    • https://mbzl-pro.xyz/web/img/podborky/files/54481852658.pdf
    • http://albino-pitti.com/pub_img/file/dalukimepijerevano.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c48f2c91---lawotirix.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc80b096b---84240523828.pdf
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/a19a006249d326391267f133bbc1c879/togelonoxufexepar.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fcig9k25g8tent720dsb19bc5l/36739608176.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/debebumuvovowupu.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd5fcf86f4ded29d4e7dc848f0e92e53/fidabivugirowivibisotozon.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160faefab5a186---34311428853.pdf
    • https://appvid.eus/userfiles/files/98063970425.pdf
    • http://www.zywawiara.pl/pliki/bijepisoxisomubonowerija.pdf
    • https://tatsolarlight.com/uploads/files/safovezipojoberi.pdf
    • 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_off0000f6a9.bin
fdd406c56ea0c7ac014516f265489369dd49b36c20fd5d25fb920b4fd9c4c684
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 17156 bytes
font_01_sfnt_off00012394.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12394 16792 bytes
font_02_sfnt_off00013bab.bin
925946c38677109d96572af088a0134db4ce1ea2999a044633c218f4930586ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 10708 bytes