Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac03963898569be…

MALICIOUS

PDF

85.4 KB Created: 2021-06-26 10:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 31379002854e0568a5621e92c8f555e5 SHA-1: 9474b86a0f467857153415ac9740975bfa626241 SHA-256: 6ac03963898569be9293aa451cb6c27a09e760a72337f71ce050933ba56b62ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebc03ae61a---73848546236.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947796e9fe---kekemokumo.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b2192b71b55---48423923794.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767fc871118---71659020345.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160711495a53d4---75273240138.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16098f73996ea4---budonarotali.pdf
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee586a350---bibumexerugerikewewedag.pdf
    • http://zwickerfoto.hu/_user/file/50821471437.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160920a1c13930---xeliwogirogolexobipa.pdf
    • http://duonglaohanoi.com/userfiles/file/joruwaxobajudapixuwipux.pdf
    • http://edgecs.net/documents/83775770786.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a063cf2dca9---88923103008.pdf
    • http://rollfactorytogo.com/uploads/files/24928744579.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d174f31a64---vexakunomabutesavasi.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920af81ab5c---mujofikufipazojebivefe.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2f587457291d85ab05e9c5468f6ce0ed/6227345458.pdf
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9ecd3e72d---tidagijonigosujasuw.pdf
    • http://compsult.net/userfiles/file/12788812805.pdf
    • http://konferencii.org/js/ckfinder/userfiles/files/89817950236.pdf
    • http://industrialdevices.in/uploads/ranuvasozerim.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4a02713aa---gagetibolibijamufa.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e85ef0ebc1---wuwuguzaludorivuzebenox.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/kssuqmm9d7sv0glk90o1uv69g3/zekateluxuvaburazajonu.pdf
    • http://accessprecision.com/userfiles/file/27546110599.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=nature+of+public+international+law
    • 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_off0000ec36.bin
54d2d33ff7c67b05189b2f7cc72fa6a8a42b284493193eb478200be95d719329
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC36 16964 bytes
font_01_sfnt_off0001182f.bin
d6dbbec80986d493fa105c839d11dc71088a9c0fb6591dc5c989407a4e193066
pdf-font-stream PDF embedded font (sfnt) at offset 0x1182F 10608 bytes
font_02_sfnt_off0001305e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 16792 bytes