Malicious PDF — malware analysis report

Static analysis result for SHA-256 d82020af02a75bd9…

MALICIOUS

PDF

75.4 KB Created: 2021-07-21 00:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62d95aa06c2ba6b923cb52c2d0b914f5 SHA-1: 0eada262f9e31c1a4997a84e73e160e2a60a0c87 SHA-256: d82020af02a75bd97628f4e0249afd2447333df617f44487c82ae4dd129e5ba8
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/b23723ea619a113d4b534df8aa63ee9c/jobos.pdf In PDF document text
    • http://cobe-ing.it/userfiles/files/zefifutijozuwakufomesu.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/98rkhntj3l6p9d7ieb48bk8g26/fadonumunefuxaga.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/2ee49a4909ba6b7de362c2cfd614a46e/podajap.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/6e716d44f4eb9429256e2ce6df010dd4/lenepadisa.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/dipedame.pdfIn PDF document text
    • http://megalaserasia.com/upload///80329611122.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/jewed.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/61f01038646f55aa96cf6ce5dfc1d154/rewodujabenetarapek.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/59958800345.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/rupujezubimetiluvut.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a41f07a3e7---63990093403.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/wusidufefi.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/kiworaniroxumu.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085b472ac61d---jobanupatavan.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210605102503.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cedae158fb---2705137362.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/30547336594.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fden6l9suq1g752oi4h401m5e2/54200122785.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a328c33c53e---kejotijesefatuvitoxiz.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ef93935eaaaaa9604b061bb04ecd01ea/kinokuzogag.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/xepiguduxakevuroranosalu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b34766855---54739379460.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+is+depositionPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B5 16084 bytes
SHA-256: 8b4c07b77da0e8b67976c8a669f0d64c67c5cb062264f19bee3e0f6c5ce54186
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1E 10336 bytes
SHA-256: e85c66be7c916f0457a9171131b83dd988d8bb2482b1f4b74514f6be02e808c8

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