Malicious PDF — malware analysis report

Static analysis result for SHA-256 804561550075a9cd…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 22:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3253a13a44be174a03d43f0dc687621d SHA-1: a2c32ebbfe8de6eb252877c14cc95e5da211ac32 SHA-256: 804561550075a9cd8095c4fa339311f6f17356c32a2c9c80185bbaa3d56bbcaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is a phishing or malware distribution tool. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to exploit users by directing them to external, untrusted resources.

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 https://queure.ru/uplcv?utm_term=accuse+meaning+in+tamil
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2c815d40d---savubopaxu.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/qc3lojphd9uoli2rnb597isjr3/xagiwonolaxadofonilarebev.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086949c34f21---62116964847.pdf
    • https://timjanen.se/anvandarbilder/53/files/39591439453.pdf
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/078599cd881bc443a3919b0bb602f249/dadojesixorodo.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c60b7ee1d---38383103874.pdf
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/548ea5cc959dda1b641371893478fed0/wuwisusip.pdf
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/39243660919.pdf
    • http://rideco.hu/upload/file/44547608739.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22a21979e3---29550202447.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/b990ad11913bcc85698ebecd8589e357/zijiga.pdf
    • https://ocw.tw/uploads/files/24208296424.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e93e39bacd---fagabesumoz.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3cb0602505f6a11a8965dda7c3eec2e2/98917501759.pdf
    • http://peaceinsrilanka.lk/userfiles/file/vemusibakowobelubol.pdf
    • http://campbellelectronics.com/uploads/toxifowisokemununamokoli.pdf
    • http://qiangka.com/ckfinder/userfiles/files/85639925059.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/punopopuga.pdf
    • https://happycolaborativo.com/uploads/files/piwilasikufirajegevapubu.pdf
    • http://nature-revive.org/files/file/dapaj.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d47d72ebc30---sajozoveluzateka.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a955437f8---94142553941.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/317b639bdbaa024c452e504acf3f8247/60988015351.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce5c615ec---jaselowoxote.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_off0000f3c7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 16792 bytes
font_01_sfnt_off00010bde.bin
f342186f0bb176a025469c73fc0c0a26484ea6204db0fac58496d9511fb62b89
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDE 10436 bytes
font_02_sfnt_off00012386.bin
1d5cae67172d7d6a32a58130ff4f3dbe3dc4dc3f55599530196213f085bfacde
pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 16908 bytes