Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87c3a481822090f…

MALICIOUS

PDF

75.9 KB Created: 2021-07-07 02:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 789d7b60bd611d1f79a778ceb06d726f SHA-1: 5f1e735c41f71426a073792b197d3b25ca9bb337 SHA-256: d87c3a481822090f06d5ac899ee0f497ef93ba1780ebdffa6d6e8d578a7c084f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a lure instructing the user to copy and paste content into a command-line interface, a common technique to bypass security controls and execute malicious commands. The numerous embedded URLs suggest it is part of a link farm designed to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://medvor.ru/uplcv?utm_term=ruble+to+php
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/2du638h2jat8m5r3jv9kq0lfbd/32142111416.pdf
    • https://masini-de-ambalat.ro/images/userfiles/wabodu.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/6c4fa7c3646a8267488adeac9203fb17/tabivinisoninizekaka.pdf
    • http://psychoterapia-przemysl.net/img/userfiles/file/wezimolodowufixonewuzofoj.pdf
    • http://studiomanzella.com/userfiles/files/wufiruwipikalawepujogi.pdf
    • https://advantagelic.com/singhania/downloads/file/79971705043.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495be414d5---zonunavipaderuf.pdf
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a63b5e92a---18169461146.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609204de2f056---3400407859.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609288f4a422e---56535877784.pdf
    • http://bio86.fr/fichiers/6487830489.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b3d20400---wadabewodudot.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cd2969aeeae4e6342d577c2c0b2b88d1/mafujebululiworavoz.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4011d888b---74079110474.pdf
    • https://study4student.com/cache/fck_files/file/29659194085.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/od339c2esk746k2o98f0ko9dra/9801574086.pdf
    • http://younewstoday.com/task/userimages/file/rowipidalima.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2240db484---28865128781.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/04ce2b1c60146b49e3ee8e2980321aea/binafasemubezof.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/16dcv46f3ojf9a6n6466cid3q4/lolasulexudelutafig.pdf
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb4e3bb25---92990430065.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608922cce01a6---24246160210.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_off0000c68e.bin
3345c206adb3f830505e5f42bf9571ba39589fc9613a9fe4aeeaf8c3482fda53
pdf-font-stream PDF embedded font (sfnt) at offset 0xC68E 10008 bytes
font_01_sfnt_off0000dcaa.bin
5aaf143191333387d2be42ee222f1dbd809b24f6b7bb84efae8afb194b0a92c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAA 17468 bytes
font_02_sfnt_off00010aa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 16792 bytes