Malicious PDF — malware analysis report

Static analysis result for SHA-256 6980d33840bf73ce…

MALICIOUS

PDF

107.7 KB Created: 2021-08-07 15:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c58d30217cdb5757866b9b413d148558 SHA-1: 6318cf4429e524c88934055d88fde3168500feac SHA-256: 6980d33840bf73ce20167ca790976fd708350ace93ae6ececbb11cbf6ea224e5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The 'SE_MFA_LURE' heuristic strongly suggests the document is designed to phish for credentials or session tokens by tricking the user into approving an MFA prompt or entering a one-time code. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, likely serve to redirect the user to the phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://studiolaviano.it/userfiles/files/mipefav.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/4be8f8a4f6d9f0c87b6318e051f5085b/38243990973.pdf
    • https://xebecdesign.com/xebec/userfiles/file/rekozalipovodojud.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f433c1e21b1af1321382a2f995676a78/ruboliw.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817e0fbf7ee---nigekekuwabuzogepubegoji.pdf
    • http://taiyoaquris.cn/upload/userfiles/files/20210620030939.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608835cb93849---vorirogukurejuxiva.pdf
    • http://adacu.org/userfiles/file/20210703115251.pdf
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0603/df3583111c81381443df886d1d92d921.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/sojowera.pdf
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/97ce157be19b0e73b56c97c630c20d4d/pomadelotimagexolirofotop.pdf
    • https://chmelo.hu/sites/default/files/file/guregarufemix.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e00b12513c7---dezegogalu.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2b2f77d2e---nelufexub.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606faf1bb80bf---31663330082.pdf
    • http://www.lnk-creation.fr/upload/file/79414263621.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d61dad1831d---20394791871.pdf
    • http://doktor-okonski.pl/uploadimg/file/63947544891.pdf
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/48424206982.pdf
    • https://hanedantoptan.com/upload/files/82777645288.pdf
    • http://remaining-mc.de/userfiles/file/menapasasebal.pdf
    • http://edwardlankin.com/clients/86087/File/doxef.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8d0985dbc---77995316077.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ece5a77---gebafewepox.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+cash+out+on+gramfree
    • 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_off000141f1.bin
40f54c792ad92676b2395e8cafceca5e0f1d616963dd826bc0e249780471dedc
pdf-font-stream PDF embedded font (sfnt) at offset 0x141F1 17684 bytes
font_01_sfnt_off00017007.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x17007 16792 bytes
font_02_sfnt_off0001881e.bin
f673a53d0a18e17dcd1f8cb88d9f964df4ea98d93910d623a1a83ebd2695763e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1881E 10820 bytes