Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb68933c942b8067…

MALICIOUS

PDF

68.5 KB Created: 2021-09-26 01:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66f6d1e659055a32be695d07d9a23923 SHA-1: 2c8c739f5acf229c81b5c76c570e60b6c8c303de SHA-256: eb68933c942b8067fc185836ffe7e35fb3035dabdb1992d4f91949823174d49a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely responsible for redirecting users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 https://huntic.ru/uplcv?utm_term=fb+liker+app+2021 PDF link annotation
    • http://farmaciafici.com/userfiles/files/92833905772.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ahl51bl4tprnk2hv2bmcpushur/59425836495.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/20887726050.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/64109399043.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/bodesar.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/46cb8f81497d94e0e7db0b7d9ce3b12b/kudaresemofemijeloxuv.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xidolomijazadezomelojo.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/9108603692.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/mowagisuj.pdfIn PDF document text
    • https://landi-bg.com/images/file/26328367822.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/161335f95a0232---2676806304.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///xatarumema.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/vatubewu.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431ac1207fc---70168106704.pdfIn PDF document text
    • https://kaptenhoki.com/contents/files/63493991488.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/49293046364.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/18416672536.pdfIn PDF document text
    • http://castel.lu/userfiles/files/57429690975.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/96602569235.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/runimimubetiwoziluvipik.pdfIn PDF document text
    • http://traktor-tv.de/sites/default/files/file/lilidijitonusanewa.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_off0000ae9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9E 10260 bytes
SHA-256: e45abd825b96f99a911ca2284879df254031b7704e5e8bd51722a52711348012
font_01_sfnt_off0000c58c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58C 15544 bytes
SHA-256: 8e6796a0a2a6f70ca01d6a4d26409b45b6e36e19710912a990615bfc3c498911
font_02_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1