Malicious PDF — malware analysis report

Static analysis result for SHA-256 b98a3e2746a34a14…

MALICIOUS

PDF

87.1 KB Created: 2021-07-02 02:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: baad088fbd390f1221517cbf3156887f SHA-1: 737762cd8d885cee6b5ba87f1d735df7607ff0d2 SHA-256: b98a3e2746a34a14fae87fcbabd04a4957693e5a61edf508b724d50b818adabe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://philabc.ru/uplcv?utm_term=natural+cleaning+service
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4c55aac50c15ad96bbc15e612a157be1/rinobojegu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6040e67578---99183033270.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/c6ppteek4ajsdb690qekjl9q44/30755646759.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac10a467943---gofubobilitipegujat.pdf
    • http://www.conectadoscomdeus.tv/arquivos/file/dagipadenap.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/21859717416.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1d76996189b33b7c52882afd2fc16e45/kisowegawufokolobopojili.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bac248f033---bipubupunaruxelopazelijo.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/jiruvawuxakikipabaf.pdf
    • https://twr1115.net/files/fckeditor/file/malodet.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2449641862---13163091065.pdf
    • https://motelandratecuci.ro/userfiles/file/53562806425.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f17dcc7fe0---zenun.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e1e2e69d---zimusaf.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c5ae4abe9---vopakeboruxetiwixuw.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/q5088mge74kf8nmd6r2ksr2kbq/wopujuwavuludeb.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c873cbeee55---mivetisulalivojaxopun.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/8craequbo8pflb2i4839fprvok/reforosiviwanositijedodam.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/dcac0038c81c9facd2da1fb77aaa3d11/vadikala.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb4bbb2236---23859079579.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0e3407611---midanaganaguparalo.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b0aa6828437742eed038bf631ed697ce/68900992326.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1607870e37244d---tezadupabojoza.pdf
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/d02e7fc7c3c69266630816e7729fb365/40441976947.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1f2229f51---98582021616.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/2644d23e5138b2968a9fdd961cf4dcf4/65463006885.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_off0000f21c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 16792 bytes
font_01_sfnt_off00010a2e.bin
fac333fdb86374a75019e08c4f03b77d1824f576992ce79cb5e31ae7686a66b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2E 17320 bytes
font_02_sfnt_off00013741.bin
329e196c6f35a40edebd82bf17d7a36991a8f2b40af366e8a573891e85d0abc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 10428 bytes