Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b0b56c8168453df…

MALICIOUS

PDF

83.8 KB Created: 2021-06-27 06:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e7a9e6929b43fe77bdd5ced1e2253d77 SHA-1: 5e1cedd00f40223bc7ac27cbd1df77b29078514c SHA-256: 0b0b56c8168453dfbe4d20d5a42bd5cef2d5c60460457e0de761435de8ca4f0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160953afe19445---rekepebafozipez.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4bb008389efc2dafccf8167e1b915e9b/gufoto.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/acf63b72ebf7f4857727a3430098ae80/23074853883.pdf
    • http://polipack.ru/content/file/6635374285.pdf
    • http://aroma-es.site/yamituki-n/uploads/files/70064497192.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072cae437b56---53911102625.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99e3f266e8---31600412067.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/jonanujames.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/22p5j7ehcsrfo2a0fb8g7af7iu/zifuzumuwejezewateb.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58afbee8d---tivesuniwezenanovo.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b188945231c---birewugizewalunitewiso.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ee2ee3ad71987756ad94834997eb6f3d/lalumomomikoriguwajolawi.pdf
    • http://falconfam.com/ckfinder/userfiles/files/88448779571.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16094179b218a4---59773042738.pdf
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/bcfa60bd6282fb1ea663404e75abd273/puvikezeburezitilaz.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f34dd56490---zoliwozesefawumifen.pdf
    • https://chptravel.ir/data/file/54833171034.pdf
    • http://studiogaleazzo.eu/userfiles/files/vilom.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3d35f624---43123964581.pdf
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072254eba4a9---kunanolerofewut.pdf
    • http://alimentosldm.com/userfiles/file/38342621223.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=similarities+between+summary+and+paraphrase
    • 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_off0000e507.bin
21a66066b19145aef0c2982b63d78ec868056af1582f8bf4a25ccc470a341674
pdf-font-stream PDF embedded font (sfnt) at offset 0xE507 11052 bytes
font_01_sfnt_off0000fe5b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE5B 16792 bytes
font_02_sfnt_off0001166d.bin
e1facf2359a2140df6b9bb584024ec06e03b88f3ec7d3c4ed5ee90008a4f5bc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166D 16836 bytes