Malicious PDF — malware analysis report

Static analysis result for SHA-256 0191f921230f2c09…

MALICIOUS

PDF

92.4 KB Created: 2021-06-28 11:22:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b7ff217ab48610d6bd8268d7422572b SHA-1: ac5ab31a36d30f4500b67dddf3c8194ef446d498 SHA-256: 0191f921230f2c09e47c3ff1f16eaa010c40fa59394d8d06b296e28a4db58711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/fa6ed3f3c788691ad176b6b1f004462a/vofulisonugodedazezojiw.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ac009e4ee---14920435197.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607afd5124813---26969252051.pdf
    • http://knuhpharm.kr/userfiles/file/20210618140628.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9c62ec776---20920835250.pdf
    • http://cycling-software.com/files/file/wewuvuxadux.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9aae0e2627---86484412028.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d207ee988---43454644833.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c66941a5e---pedupik.pdf
    • http://alemotta.com/resources/original/file/15184793647.pdf
    • https://local-atlas.ru/userfiles/files/jomenitegiradekab.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/e2it59ut351m6pr2q7elm6aefj/79331916807.pdf
    • https://motelandratecuci.ro/userfiles/file/89427216983.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/2lnlngjionsm2h8bmrt3g9ps05/13160224459.pdf
    • https://kar360.com/resimler/files/32366872330.pdf
    • http://absolutelyneon.com/userfiles/file/wuwusav.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/37c1c97eb89b9925dcde42852487a279/49911115372.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/9eb012d9a6ff1069ab72aa20582d7a31/38181654908.pdf
    • http://vandientuchinhhang.com/upload/files/23090328417.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7e47c497---2249260760.pdf
    • https://bloomland.com/sites/bloomland.com/files/gemuluj.pdf
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64820297c7---20511397404.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608532b713cb1---benaraginitujuwinope.pdf
    • http://casaatlantida.com/userfiles/file///70703386063.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r963b4hfi7apsutvn10ej89en4/buvolekagabiwabuxulipisur.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/7riknnd544eg7jd5miffe5dl98/xuvagejomar.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=at+the+mountain+of+madness+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_off0001048d.bin
ac6c04b90c3fef6bdf724a8a1702b37839153e36cce5a24a624b9771c340cad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048D 17920 bytes
font_01_sfnt_off000133cd.bin
ac8b1724f8f8e3fb9d33afe0473d416e81c9ea6a109dc7496cd07530d5a21d14
pdf-font-stream PDF embedded font (sfnt) at offset 0x133CD 10700 bytes
font_02_sfnt_off00014c33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C33 16792 bytes