Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d6eddc41359e6e…

MALICIOUS

PDF

74.7 KB Created: 2021-09-04 06:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d403b9f0d4ddca7c3e2cb37d6da0691 SHA-1: ce9c6f4252c1f3dc855d89bdba106446ecfb4b39 SHA-256: 37d6eddc41359e6ea5e521d829070bc69d00368b0f8200bb801eb69af23f5199
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and multiple external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of a 'Password-protected archive handoff' heuristic indicates the document likely instructs the user to obtain a password for a separate archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/rvvseffk628266gio2o3107ku2/wamarufudonem.pdf
    • http://photo-preiss.com/upload_files/files/fanifezefafoladiwog.pdf
    • http://cp-tournament.org/ckfinder/userfiles/files/bakogituxak.pdf
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/86352241751.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fb589cfe9---rixegasin.pdf
    • https://careeraccelerators.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc82eb67be---45958561077.pdf
    • http://www.chatanakonci.cz/userfiles/file/23626471475.pdf
    • http://jatyn.cn/upfiles/202106/file/1624408497.pdf
    • https://valleyrentals.com/userfiles/file/25501716145.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bca973e68---suminebosowakamige.pdf
    • http://mexvp.com/ckfinder/userfiles/files/pelefanagufuponar.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2912m04ep6i2mupatsjdij83j7/rubabasudo.pdf
    • http://sipsak.nl/userfiles/file/7614626034.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6i0dsiqssv6jt28pj92v8313eh/14755891567.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733a6044d9d---manekiveboxevanet.pdf
    • https://silatur.com/js/ckfinder/userfiles/files/bozetivoguva.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160766eab6be6b---gupimevikeg.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d903a2562---xusiminugi.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f6090a5c40612a38f374b6d4f6112939/sumupaxerabalefojusugoru.pdf
    • http://mnwebdesign.dk/userfiles/file/95233426743.pdf
    • http://cfacgroupe.com/uploads/FCK_files/file/97204593537.pdf
    • http://chrisdepanneservices.com/Sites/cds/files/feguxorawipezawixobad.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/41748c9658abc57bde138809337d3139/20500712895.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/f0c3ea8654b26e9d5ac787a6909c3ae2/zesikiwaw.pdf
    • https://blsautomation.com/ckfinder/userfiles/files/toleremosob.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=apostila+para+aprender+a+desenhar+mang%C3%A1+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_off0000bdc2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC2 16792 bytes
font_01_sfnt_off0000d5d4.bin
f9e0faffcc36ffbe0511796887759eb50b9124a51cf8f1880ccd42ead0e6a34f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 17544 bytes
font_02_sfnt_off00010131.bin
b8e328f49b55386318dc4708cf74be4e5770521238aa0f4466455d54517e942d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10131 11104 bytes