Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca332a3785cb1085…

MALICIOUS

PDF

77.7 KB Created: 2021-07-05 05:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6203f8b159d4a664b720c3124fd924c SHA-1: f2bcd6f6cbc5e4e7e15904272b35e533ff9c1ec4 SHA-256: ca332a3785cb108593a32f96c25697e985cb6e27488be5d9fd9ac10a32f727de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • 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 http://naasschoolofmotoring.ie/fckeditor/userfiles/file/16908619513.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609406d12e7c6---vudifumesutiwavubumejiwed.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85fc9320e---71681150595.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/dn7vugf64nr76bl4dc0f7t283j/wazurawilewutum.pdf
    • http://onishi-kyosendo.jp/archive/25729681260.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/160739c96350ff---dezapibogisefuve.pdf
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/fd44a2bc41aefbb18d6fa4628406d282/14609259114.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160716eb7b10de---jomapokanukurewimado.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608576149cbdc---95736058133.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/tuwibesefeweperuzudo.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/6e636f3574b3fb29e644f9f7f58710a5/netinabudajepobekonizipi.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606eec5de3641---tefate.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c30c3db1e---memimidimilivasomekabufuw.pdf
    • http://netinflux.net/userfiles/file/wufovebewi.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/21859717416.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf26764d4---zifuz.pdf
    • https://alakharia.com/public_html/userfiles/file/58325119383.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160892a43c3d4c---66040066598.pdf
    • http://marinda.ru/pics/images/file/75222162901.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077bd98f2c24---kupifimitotafi.pdf
    • http://aimic.com/userfiles/file/ruzari.pdf
    • https://octvads.site/js/ckfinder/userfiles/files/80559199622.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=gcse+science+biology+diffusion+osmosis+and+active+transport+worksheet+answers
    • http://e1pl2.nazwa.pl/busy/fotki/file/rajig.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_off0000caaa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAA 16792 bytes
font_01_sfnt_off0000e2bc.bin
5d4809b8ad40c4b97beb10a820285b7e62585e89f1c1b2924499990aae1b8cda
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BC 16328 bytes
font_02_sfnt_off00010d51.bin
09843be99e0c96dc96ca26b76b2a902e48c13d8cf055b810e5eca84bbc2db319
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 11704 bytes