Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18c4bf69370f1b8…

MALICIOUS

PDF

90.5 KB Created: 2021-06-25 17:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e4cfc152840951c001b345e836454f04 SHA-1: 253c48b4651a4d9daa0411879a73d046b3a72c84 SHA-256: a18c4bf69370f1b86507ab0a3a07b628f5be93447a0f9b3149896f7a4eff3395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=how+do+you+breed+a+skeleton+horse+in+minecraft
    • http://archinfo.ru/uploads/file/suridavidunaropurusu.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b7976c39159---85718129769.pdf
    • http://traiteur-ribot.fr/userfiles/file/gurujefujorakusazadokarip.pdf
    • http://jucal.es/images/file/jusis.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/fb87933a8b48bd26d1e55acaf91854c5/74394819332.pdf
    • https://baongochoa.com/upload/file/28756439376.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eef9ab4ff---2852587442.pdf
    • https://gozdemsigorta.com/hulya/upload/files/94358763973.pdf
    • http://beiwendq.com//data/attachment/file/57097186801.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a291e8a406---vujukudabalidojit.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083756e094f4---15063629889.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a23e0441d8716026033fd8299edec6b2/12016915366.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/6svikkt78nk05hc0930bv5uqni/zibunenonafepimikako.pdf
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/200toitrgcnp7mg5fgvot9le1v/wupikezewupogenuwop.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/fe36a0c8e0a5934f07135d77662c1b2c/zosoredabirajob.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/bc293f134b63dfcf6a030e0c627d1ad2/tagotatotudikab.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/dc218cfb4538b27cf6e71f8f480f2adc/46037569906.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076baae07806---14075198051.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d742a9a46---31159332254.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/610b53a4af251ab4cfd00576fd1c3574/xewikejivazi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094211fca53b---wulad.pdf
    • https://calendarsunrooms.com/userfiles/files/485933984.pdf
    • https://parklanehotel.asia/userfiles/file/wirejakefeboxisusajunevip.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2ff87d778---64261627373.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_off0000fbf0.bin
fd90d2f5d1ba4d62b1884ad33c62b58672d9e9ffd1c2a930df7643e21b60430f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 17540 bytes
font_01_sfnt_off00012a50.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 16792 bytes
font_02_sfnt_off00014267.bin
3d1f00cffe0d80bde17a3d479ad8879bb4d153ca91dcf9831020eb590605df12
pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 11264 bytes