Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c9d525a2e54bc7f…

MALICIOUS

PDF

84.5 KB Created: 2021-06-28 05:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: be823aed4a34cff0918732dc82353fd8 SHA-1: 07736dd5228baa8efa4f4e471c1e9e31e766a674 SHA-256: 7c9d525a2e54bc7f9b1d971792b8a8d2a348ab6aa871ebef2e5cb836ba2c0df9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608af98feecba---70074668029.pdf
    • http://retroldn.com/userfiles/file/46897544162.pdf
    • http://hayatteknoloji.com/webimage/file/mufuketizenav.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/a9047b80ff57d2a4f66a0d32ecb327fe/9985948396.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3dd779ef3a---naloboxijifozavowimavama.pdf
    • http://stalmost.pl/userfiles/file/wibotexubulokizujosego.pdf
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/fodezizofakotefojebu.pdf
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf4dd172f6---fepujaworav.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/l8b15s9b0b13i3h4b5o127e39q/voxuwiludududokojijipe.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/321b98a17c17fec26baf0888b43dc5ec/47389080825.pdf
    • https://coebmsf.com/userfiles/file/rusuza.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c923616ca7---20021939276.pdf
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/fogunurepomagedojudeb.pdf
    • http://poorclarescork.ie/images/fupigemizojupovenez.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c38ad7bf00f---fezamosodu.pdf
    • http://kopdesign.nl/userfiles/file/41696600627.pdf
    • https://avonsteel.com/UserFiles/file/togasisimogefidekitawesep.pdf
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/00d07bcc910cbe930d4ec2508d6d4f07/88981316274.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gpmj4tvskg9aen8n85iuq9h6pf/dewojasaror.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/5vj1d2f3jbn8vnh522vcqa5np1/52785874142.pdf
    • https://duproject.com/uploadEditor/files/juwebefamiverewiponivaza.pdf
    • http://analogsys.com/uploaded/file/77158719560cebc344e21e.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=carrier+unlock+rooted+android+phone
    • https://mediaget.com/userfiles/files/72112206330.pdf
    • 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_off0000e8b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B8 16792 bytes
font_01_sfnt_off000100cf.bin
d2c5bb4403aaaaab00342bc2984bd4ac8a42c924d4a8d1356191a35cef35a6cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x100CF 10664 bytes
font_02_sfnt_off0001191d.bin
88bc59bc2957e54c2cf1f4f66a6352aa77395b97a1c24b5db7610ae0eb411b34
pdf-font-stream PDF embedded font (sfnt) at offset 0x1191D 16936 bytes