Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d45fee2202f799…

MALICIOUS

PDF

82.4 KB Created: 2021-07-13 23:41:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 527dd609545bebd11a061a6d332009b9 SHA-1: c924be251042827673b18157916f06492ef7c76c SHA-256: 12d45fee2202f79919396a3fefcb505878cc88dea65cdf0b76f06171d7e0c4bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest an attempt to lure users into clicking malicious links, potentially leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/uplcv?utm_term=entrusted+me+with
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0994086ccb---43796327411.pdf
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bc408dee4d7---lejupopidutizuligifom.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c43e1490---51946260915.pdf
    • https://deltagroup.bg/uploads/file/62222228205.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160be06299ae5a---taravatitejumefoveju.pdf
    • http://alemotta.com/resources/original/file/50762508011.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f95df7f3d0---64170583319.pdf
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69e778de9---pitilisor.pdf
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/18027480826.pdf
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/9v5ncsuo4tfj9oahfqtj84fc33/wovorajerafubiji.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160baf4376278b---59353825454.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/588ea060a6deb1f267eae8190274698c/nezivajijusurekem.pdf
    • http://salonorganica.ru/upload/files/52281698918.pdf
    • http://nsfeed.com/_UploadFile/Images/file/56682656560.pdf
    • http://schokozentrale.de/idata/komamixufujaweza.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/49318551969.pdf
    • http://goodslib.com/userfiles/files/27754654685.pdf
    • https://mobile-translator.eu/app/webroot/media/files/dexojagapaj.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/359a4a02288f310ceb695e120511cfd5/tafuxova.pdf
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fd08acd262b46833109aaff02f557ce0/wirekexegi.pdf
    • http://somsit.com/ckfinder/userfiles/files/zukewaxunotuzukun.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1720ae383---sabazikifavuvamuxilap.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d27dce0af---35264491895.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_off0000db25.bin
05e3dec74089c29ccbdf19444c573e5b95c9fa7f23a333c16f2bc8a3c245edbf
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB25 10356 bytes
font_01_sfnt_off0000f25c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF25C 16792 bytes
font_02_sfnt_off00010a6e.bin
7433384eb5e1deccac5524a89f3a3958192fa74e81dd855e857962c737b9f72f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6E 19140 bytes