Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4dbe9668042d7f…

MALICIOUS

PDF

90.2 KB Created: 2021-08-13 00:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0aa1412775f57abf1af8370dd1e0643b SHA-1: a92d25bcc538470a5de76d307f03568f0939adaf SHA-256: 0c4dbe9668042d7fcd0b22e4cfd91b93f00f5181af323054eff112501db6a4b3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to potentially compromised WordPress sites acting as a link farm. The primary purpose appears to be redirecting users through these links, likely to a phishing page or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7982

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://zcapitalcrm.com/app/webroot/uploads/files/midevojujigofuwobarare.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/qh518js3fb6q0nbqlvmd0d8v6j/97080083358.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e311c19e28---titutidomidakexoris.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/44467949521.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/7544834448.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7eeb17aa39dca12bb63773e038210f76/98834875628.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1cg9a9eugungtdrch7t6n12e17/56811863392.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/kezuzizugek.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/489lt5n8v7r1644vebi4atmvd9/45667903868.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/vefogikasuxuwozuk.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/h8k712vqhh6gmcndj5jjm21o70/jomozax.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/xawekejalebikajomamutuf.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/tozemirotoxajoxusevoli.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/70549989625.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c591820d5c8---zamusupawukexal.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a884db3d56---tapajeza.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160acf659c3bbe---dufatuwaju.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a504161f2d---75886222421.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/muwufitunoz.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/a9ff6b755c1b88b47c6f5781eb2c2082/nagolanetemoponere.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/8b5d99a38fa001c171f09d7c29a77d11/vimexazizuzor.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wapibepexozupolamopadamaw.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/lulalenibixoxukip.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/86806737977.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736778a6e36---bimibesefuk.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec37a8e2f5---49489224862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+set+an+armitron+digital+watch+wr330PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 11188 bytes
SHA-256: 1115401b9439a0ebc48e8e76ce3d4048dbc1c8dc4642f401f5cbd26c5df1cd22
font_01_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 16252 bytes
SHA-256: bfc7ce51a1a9b37382af61f0075eb0cdb972126da031002d338643432d80e6e4
font_02_sfnt_off00012213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12213 17732 bytes
SHA-256: fd3c13c1c78f039ac105fa556fa4012df1a6ae0b650cc11ce566679fc64580f2
font_03_sfnt_off000150d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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