Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b6ba0999ce563dd…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 07:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0385b90287b79aa608c6a6a521627a23 SHA-1: 815f0127881a3b32b08e2e556cc7d0d9774a0922 SHA-256: 4b6ba0999ce563dd07112c5eca08e7c4ff19afd3e332d970659d0901026169e9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to websites hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were extracted, the structure and URL analysis strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7431

Heuristics 5

  • 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
  • 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://chineseclothingonline.com/File/nugarefe.pdf In PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/gfj8rkpv8i7dbibb6dsgq7aqa1/lavitolukomagavaxojubisi.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/79240416481.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/dufidilapetazi.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/nenofawix.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/5835803821.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/que2q43jdk17mdmhnscnomb0l4/wukepefoze.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/todevola.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/voguviweroriz.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/cdnm6kt4pq7956gudcddhj2k2t/12206800788.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/kuxifidolozozudegefusidel.pdfIn PDF document text
    • http://cjatkinson.com/userimages/69363960344.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/7omr1qbthis000c0idhdbgpret/molosidezovowalipode.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/cd48f1a3ecc83a18c3ef35545226a2fa/32636756607.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160802ac0820d7---29745107172.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vojekivigowojugakokajajo.pdfIn PDF document text
    • http://katela.net/userData/board/file/wabesumuzur.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/49760041313.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9bb42962---8627462540.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/73842700380.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c2404b5ba---4517829410.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/92919083778.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5eef7449d---7885505749.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/22135291964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+consonants+and+vowels+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F3 10904 bytes
SHA-256: da4822a1b77234dc57f6d255f20b389712f32936cd219d373c10e1b7e81d2f31
font_01_sfnt_off0000fa34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1