Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e6233e3d0a4fc99…

MALICIOUS

PDF

86.1 KB Created: 2021-06-28 04:46:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 18e311a41bf4b734beebfb7e033aeea5 SHA-1: cbfa3d6c1604426edad624af19056add4909daef SHA-256: 9e6233e3d0a4fc99b9dbd456bdd36b50343447bf9c3cb8adb1e1d4a5e1348eac
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, likely intended to lure users into downloading further malicious content or submitting sensitive information. While no scripts were directly extracted, the PDF structure and embedded URLs suggest exploitation of PDF vulnerabilities or social engineering to redirect users.

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://wastran.ru/uplcv?utm_term=shadow+dungeon+osrs
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/ee57bf56be08401b8104b44225d21846/pegadojineri.pdf
    • http://renovfab-menuiserie.com/userfiles/file/37247196482.pdf
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/d6c852284a8c52e006dbe3613226f596/tusine.pdf
    • http://fashioneducation.ru/userfiles/file/sukig.pdf
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/lodonejobatifap.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/df5ouino28r8e8pappe611b7r0/26420540268.pdf
    • http://rollfactorytogo.com/uploads/files/korofon.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ade427650378de106ec5c609eeafede8/27450144929.pdf
    • http://fygl.net/uploads/file/121637424960.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d38bba5776d5341bbae50b2fef9393cd/kusofa.pdf
    • http://dotacjedlaoze.pl/userfiles/file/bogavefatofere.pdf
    • http://spreewaldatelier.de/img/editor/file/xijexilisudujepodadal.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/1b994caf37f69a897b7b129443055014/paxebimotoviga.pdf
    • http://mp-journal.com/media/file/welazeti.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95abf8d437---wigubesefulojosu.pdf
    • http://adance0112.com/upfile/editor/file/lodedipakupimu.pdf
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/e36cbpeg9kusk0fbu6r7noqohb/71456697569.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1ffa508a3---rujebaf.pdf
    • https://info-jimukyoku.jp/lot/upload/files/92580655875.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/i41t61hs5tac0ns3s6dse3ito2/49209731148.pdf
    • http://prime42.ru/userfiles/files/gaxetabozogisugifowa.pdf
    • http://beveragesgs.com/userfiles/file/kagirupaxajozixebagesem.pdf
    • https://alteanetworks.fr/img/file/33550804257.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/059a7f46fbc55c2d415d12c2d42d1251/4258137497.pdf
    • http://brianhaymore.com/images/e/file/xumituvumiliwaro.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/besopojalevenok.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a805f73f106---42633388623.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_off0000ec55.bin
02daebede0c8e2ba73b8e10101b2d4c49e3b0d2defdfbf91073630e70edb54f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 10552 bytes
font_01_sfnt_off00010428.bin
45324ce9950c4370e023b1e694cd4ed6bd9b45b94b37d3beaa9cfcb88a5d6c85
pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 18400 bytes
font_02_sfnt_off0001334b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 16792 bytes