Malicious PDF — malware analysis report

Static analysis result for SHA-256 3137839801b342ea…

MALICIOUS

PDF

74.5 KB Created: 2021-06-30 05:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d93ef32d41ac51b0c728a59918e70e14 SHA-1: c121d3acf51e793dd11816a1634762ec7fb521b5 SHA-256: 3137839801b342ea69cf37bdc582d982ff5d3e4e171cb9cf1f965576f5659f00
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://feuerwehrobrigheim.de/upload/files/40084601470.pdf
    • http://travelshops.pl/userfiles/file/razenezarexizelilenaxek.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nu594fb921rk4i8ni2kbgn3otq/76650625732.pdf
    • http://brlairport.com/images/file/53145067783.pdf
    • http://zuche0551.com/upload/file/74267854284.pdf
    • http://trimblehighalumni.com/clients/84492/File/jifarumewivedojixufemuka.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7eacade51---52595384351.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9ea036570---daviwujogit.pdf
    • http://ankurgroups.com/userfiles/file/9945370496.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4du85g054kjhphkiqbl3dra1m3/fitogerofipububomar.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b86aa4a6802---66616278531.pdf
    • http://oreade-breche.fr/userfiles/file/96197855379.pdf
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070014341a41---60872367361.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/g3ea283gkje4h07ojenlnt1ll1/baminarogazejerela.pdf
    • https://embassyinvietnam.com/webroot/img/files/fikekotokubunalito.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/nofubite.pdf
    • http://resetimpianti.it/reset/public/file/jojimuvifijusedalojunukun.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a9d69f5f869fc543efdc13f1e1a39100/84717905620.pdf
    • http://bulmarconsult.com/files/koguwusoza.pdf
    • http://beulahcooleycollection.com/clients/870349/File/12248231228.pdf
    • http://studiotecnicomartani.eu/userfiles/files/dofagabolomir.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/998a60f853e72c0d27e0a450ac22ce60/66394910253.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/df39efe03259125f4a74ced129e11494/daroziwego.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3088ef35fc---57242309814.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/nasesapumakeguveviso.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=metres+to+inches+calculator
    • 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_off0000c138.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC138 16792 bytes
font_01_sfnt_off0000d94a.bin
5ecd95a6fff8bd1ea58b59e79ce28f19cd771a95da0519ba47144680377de15a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD94A 17344 bytes
font_02_sfnt_off00010510.bin
3f22ee08258096886aae50c25b16a1df47e4e4b7954241700b18ba72b277c8cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10420 bytes