Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da90f8e451e648f…

MALICIOUS

PDF

69.2 KB Created: 2021-06-27 15:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d64489793a57ddd9471ea386b6a14436 SHA-1: 204844e768c2f4ce6c8adbe6ded9ea09c00a4459 SHA-256: 5da90f8e451e648f30cb5f2d800e6e74d31ab66fcb1d51685fe0304608e802d5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable domains, suggesting a multi-stage attack. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://dzbnf.com/upload/file///fejusuvuzalixozan.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/b681cgi96pls67n09dcbif4r42/26667145839.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/3e3590ee3767599be6824d72a56f8c49/50509207098.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/tqua5rr5lv3fpi74j9ub776m21/93624639306.pdf
    • http://elitvorota.ru/f/file/taxijekej.pdf
    • http://pathtojanna.com/userfiles/files/43168127691.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8f3066b29---31082933996.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/0aab31709a5205127142a60a8568fb8d/29403642879.pdf
    • http://www.findvoters.com/userfiles/file/tazinedokilowo.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/4q5mudfk88plt0hmhk48sn4ea3/96689541833.pdf
    • http://robwalker.net/fckupload/file/58303454113.pdf
    • https://dm288.rs/slicice/file/47504455093.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/06344ede7075b26df992041f71ee0f8a/bareramekunig.pdf
    • http://charivne.info/images/file/4630528270.pdf
    • http://ibb-online.ru/f/file/67148110185.pdf
    • http://jucal.es/images/file/88611609497.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/fd11af1afd8fc070168ab1bfc727b0c7/58631906222.pdf
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/28303974780.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bd96dd5a110---dawefex.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/keqjl8e8mcglg46e89c6rh9712/bubikofobikiwavopudox.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/dadagukupi.pdf
    • http://ctyrkolky-gamax.cz/data/dokumenty/96053073962.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085a61e20bdd---widodomaxagelevesuxare.pdf
    • https://planet-for-events.de/userfiles/file/notise.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/94b8c9805041dba224c4ef9fa0c02490/30972727248.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c439f11e5---junubajuwivibi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=causes+of+trismus+in+ent
    • 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_off0000b5b6.bin
652bd5bd931402aa5621db6e5fc5d7ce3810e94246f547ca6001546e405a9e9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B6 10460 bytes
font_01_sfnt_off0000cd76.bin
1dae6a7a1baf9f5a4e8ab5eeadd679c48eaae4fabf47918977764c92f466f06f
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 13860 bytes
font_02_sfnt_off0000ef8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16792 bytes