Malicious PDF — malware analysis report

Static analysis result for SHA-256 723b115cf982eee2…

MALICIOUS

PDF

89.0 KB Created: 2021-08-26 04:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9259fbb5773df861cf92fe3e9dc47669 SHA-1: d1fe6e7f58b9037352e6cda463e01c3b9fbd5528 SHA-256: 723b115cf982eee2cac2dd72356cd1e388ee7a9429795da53bbc1b622b684cf1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/kazajemala.pdf
    • http://kvbm.org/pds/userfiles/files/68738900715.pdf
    • http://kayapaliinsaat.net/file/85673252390.pdf
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/74778407117.pdf
    • https://reparation-mobile.net/userfiles/file/75708442703.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bab3a9359---rudakazezafaxubelafota.pdf
    • http://viorina-deko.com/images/file/32768316250.pdf
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/4lnu76ib9b3p4hf2asknlfl89i/polobojexibizaxulodoveme.pdf
    • http://jar-ted.pl/file/67735465980.pdf
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9726376700.pdf
    • http://spamsmsgiare.com/media/ftp/file/33659339280.pdf
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/5f04e2f089a864d20488199c86acce2a/jovuvulonabewazot.pdf
    • https://ev-owners.jp/userfiles//files/17626465224.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/camo9d564atrtif9oo0cvmf3da/41342287526.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abdd2713620---melaxenetujurabe.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/c91c4e78c3558c64e099d2efe40ed988/sukeke.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/214dd34878cc2aee8c91382cbf3316f9/valuverigoketevarubimo.pdf
    • https://bczenekar.hu/files/file/54034274971.pdf
    • http://wsp.pl/userfiles/file/1326883937.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3888c62154---mizizukamisesasu.pdf
    • http://deckdreams.ca/clients/3/34/34055ef41782f8f15ebf372c1e39ecad/File/delezadadutuginebavud.pdf
    • http://bestbelly.org/content/files/files/pimetimulekerosizojoboref.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e284ab7bfba---xomerukuwos.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=the+rest+in+tagalog
    • 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_off0000f440.bin
6a3423c1c97ab2dde0c4aac1b613ae4afc9904cfedd609636daa5d0ac8da8bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF440 18980 bytes
font_01_sfnt_off00012567.bin
e325d57835835680dd5891ccf340cb465b1000a9925a062d737eb678c912556a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12567 10352 bytes
font_02_sfnt_off00013cbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CBD 16792 bytes