Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7a151974c6bb83d…

MALICIOUS

PDF

88.9 KB Created: 2021-07-27 20:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8be41fcf62e4ae12caea8e76d32692bc SHA-1: 379e814b3085112e8a054b099450570eacd4b481 SHA-256: c7a151974c6bb83dd0504a5c0100f389711042c84b96174afc1f1d645334d541
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users. The presence of these links points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f620a910a17---xigebarufijutewa.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/hsht3q0qse307tbetn16m1r5c2/perubowopugokoxesovotik.pdf
    • https://gymlesgeants.com/upload/editor/file/kibapal.pdf
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/21230495125.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f92f72882f3---xorisavavofo.pdf
    • https://norservis.com/files/files/butuletolujezane.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac7cc2e86c5---84950277406.pdf
    • http://ambulatorioveterinariomariani.it/userfiles/files/mutenobenuxazavoxuveruzeb.pdf
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/05f16a70b615d85f50f8c28ccc53007c/timurirakaridujowesimave.pdf
    • http://tuclubcr.com/campannas/file/33769123592.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99f1b22eef---zowupuletawegetoxejose.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/v545hkuk2hggt8ptiiog0ov3t0/59718610878.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607548d59835d---87901598878.pdf
    • https://corghialberti.it/file/wemomibotewebegume.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78fa43300---najitodu.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16224759680933.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdf30cd6e3---masixarelizezopinorutuj.pdf
    • http://www.look4job.gr/images/_user_na/file/65798502518.pdf
    • http://marinapogon.pl/upload/file/rugofar.pdf
    • https://growyourmoney.in/userfiles/files/metoguni.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/733c8f9f7bf977fa751e298d68fd71ff/dalatujovilibexo.pdf
    • https://luminex.pl/upload/file/8779728686.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=voiced+and+voiceless+consonant+sounds+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_off0000f8ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 16792 bytes
font_01_sfnt_off000110dc.bin
3bfcb0fceef8c70f7c3c33f3ce6ebe90aa3fd3d157ab3be8d95c43541c6dad90
pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 17000 bytes
font_02_sfnt_off00013d56.bin
ee172beab822f83c754423f60c304eda2261172614d4268a37d0fb17ef6c3024
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D56 10648 bytes