Malicious PDF — malware analysis report

Static analysis result for SHA-256 25be55105ee0cbdc…

MALICIOUS

PDF

95.0 KB Created: 2021-07-02 13:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7ab961dee6c5724c37505d325d5a50a7 SHA-1: 86e5be422d936e9372bd6255bc7f20062eba4860 SHA-256: 25be55105ee0cbdcce5125cb64bc0c08af38b2426ea1309eb6cf53f2a27ece2a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://goldartline.ua/userfiles/file/kuripasegijoripezijo.pdf
    • https://i3mit.com/shopadmin/upload/files/69847113835.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982aa64bdc9---68010952852.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iuj3enakhvinflf1mcd43f2dgc/texudisukoro.pdf
    • http://harveyfamily4016.com/clients/5/51/51a16c7d09a65bdad6d3cd8ef7da6b4e/File/duniwuwo.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16096211ee295c---lobetekisozesulusawonuki.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a024a1a6a59---5794204586.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/df6vegislek46h6k71gtgt0vhr/88086508236.pdf
    • http://stressmanagement-karriere.de/userfiles/file/madakewovepeforemukesa.pdf
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/643cad67a7f0148b0b8e4e6dc52ba616/49449662985.pdf
    • https://propertiproperty.com/Uploads/userfiles/files/67561506763.pdf
    • https://weeb.nu/userfiles/file/gopeluwubuwa.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/49ee2ef8dbeef68fda6f42053e524bef/jenutal.pdf
    • http://leaguengn.com/userfiles/file///32328109619.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d235ef7ad3f---67622475157.pdf
    • https://baptistfriends.org/media/41256275648.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b6d1a3d1c---koxar.pdf
    • http://www.anjhimayath.com/upload/file/zepojemirulezi.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d6qmajvj0ccdn9g2qr6qughujr/67842777738.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/fbcfdb1c34c639c01410100b76dd93e8/97271774735.pdf
    • https://tidaksusah.com/contents//files/58558440254.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=two+sample+t+test+degrees+of+freedom+calculator
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f59c.bin
e34958bf4321a9e415fb1d135b0b53b8fd7d0e48a1857748fc9be84231ea95cc
pdf-font-stream PDF embedded font (sfnt) at offset 0xF59C 10916 bytes
font_01_sfnt_off00010ece.bin
3e46b879910e927943b57fd5c20adeb26d7d3e3f23c3523b8353c39297230381
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECE 18496 bytes
font_02_sfnt_off00014033.bin
5cd8a120e106fc2d4fc1855603a636a3ce922decfb1b4d98f17a4a5450337c58
pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 16344 bytes
font_03_sfnt_off0001562c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1562C 16792 bytes