Malicious PDF — malware analysis report

Static analysis result for SHA-256 64327f0ebd6df2a5…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 21:56:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18586bd9c054398992086a5f77df08bf SHA-1: 5f4ad2664a5447a28b97c0e0cd01623ae532c5cf SHA-256: 64327f0ebd6df2a5f2495e82c9f8cb8c2aca1a5f484f3889168a60f44822880d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to potentially compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e20fb6e652a---61997153189.pdf In PDF document text
    • http://fouladsazanco.com/Upload/file/19664443536.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/9103963988.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607d124bb6606---50311945930.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/rowakizumumivefifadudesis.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/d4330e3a85cbbd680ee0b9135456757e/mujuwetikexen.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jomekivuribesanebasimapo.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/xezosuvikepezobulapapa.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/bogd7agncdj9j36u03rtde5vmj/38977708918.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b784de05f5d---14204157384.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160983bd66fe04---37601142513.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210821050556.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974191c7232---93771681762.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/0d26b90b372ef9394e4f3cbde805a7d7/49293828815.pdfIn PDF document text
    • http://irths.com/upload_files/files/15768920420.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/30545567361.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/lelaliketaxugibofisezupar.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/31282b08403e909a3dfcd144d26801a8/pizozusij.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/41432116863.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/jigigififuma.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/240f47761f18f1609893361983041a64/88478470158.pdfIn PDF document text
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/sobodabopivagosu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1049c02d6---wogutunovosikobimor.pdfIn PDF document text
    • http://lamdecal.com/Images_upload/files/52446654295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=wniosek+do+ceidg+pdf+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE243 10936 bytes
SHA-256: 4db196f0ae86be54ac5fc9089be0bc17727a1823fbab5c0d41c6d69bc51c2445
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 18960 bytes
SHA-256: f09a1c8e9c84ed2d8925fefc65f40c0fd888ac856ea9144a89bc64098f30536b
font_02_sfnt_off00012cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1