Malicious PDF — malware analysis report

Static analysis result for SHA-256 c208d5f24a61f56a…

MALICIOUS

PDF

88.8 KB Created: 2021-07-06 22:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee34792346fbe1f1735d364a7a9a50a3 SHA-1: 5b2aa1d702fbe4e71de5b781f74a210b9771ee09 SHA-256: c208d5f24a61f56a439e75a1312aa7af65c09f1fcd83196d150f133b140d44a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=best+timepass+android+games
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16096c2a757d44---noragebovad.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a7618defe---31578624212.pdf
    • http://accessiblevehicleservices.com/userfiles/file/mawokapasuzowubukuwovuf.pdf
    • https://vegas-shop.net/uploads/files/39426570698.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160953771ed28d---fisoruduni.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160700df5dbd02---rinixod.pdf
    • https://petek.biz/resimler/files/73492274707.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/ee2c1d698797a5a5a287ee60a17d7d09/59394529672.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462480e5ac---5020811552.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/4beef96cd6b9ebaedea5a1a67c5f1e42/72414149051.pdf
    • http://speed-r.com/js/upload/files/lazepolifiruwewedunexe.pdf
    • https://annjulieskarpmo.com/userfiles/file/jezujimewutagewepikakijez.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16094be25d53aa---jarijuze.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/3erithb4gsaq6t4jps80vkfgds/vivifuwuragilalodid.pdf
    • http://ohsclassof73.com/clients/9/9a/9a21b0b253f7c4eafe662346d237c286/File/33392393026.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bfe2c1ff---93243275156.pdf
    • http://ilyxrace.com/userfiles/files/34603422774.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/80sa3p3ot8aptdort0eoj8upk2/15400681952.pdf
    • https://amatnieks.com/pictures/image/42328639427.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a56b8d4cbe---71195971352.pdf
    • http://ankaser.com/userfiles/file/49544925514.pdf
    • https://reparation-mobile.net/userfiles/file/23044499256.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/ft619fik2l22g7lgks6jopig3m/gulijulit.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c16ed5973be---dovizakomofazabo.pdf
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/52635148519.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_off0000f2dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DC 16792 bytes
font_01_sfnt_off00010af3.bin
ba980017fbcdc71040e1a954de2231ac5040785aaf0f236311c0b4ac5d962bb4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF3 10740 bytes
font_02_sfnt_off00012367.bin
c33562a0b00ac4e6665ff3ab3fdde6aa1d4610d695f17834fd13157c5362d313
pdf-font-stream PDF embedded font (sfnt) at offset 0x12367 19420 bytes