Malicious PDF — malware analysis report

Static analysis result for SHA-256 57a3cc376ab89fff…

MALICIOUS

PDF

75.4 KB Created: 2021-07-02 18:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 887af98de888ffa19aa704a6b354d5fa SHA-1: 3ae0a34dd6e8a3330f5dc7a7353a005f0c0d73a3 SHA-256: 57a3cc376ab89fffff2174ac31256d781a8c1d34aca79727cbfb3a1fea1fa1ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, specifically within the 'formcraft' and 'super-forms' plugin upload directories, suggesting it's part of a link farm designed to distribute further malicious content. The presence of these links indicates an attempt to leverage potentially compromised infrastructure for hosting or redirecting to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160bb857fca3ea---10163515082.pdf In PDF document text
    • http://mg001.cn/upload_fck/file/2021-5-10/20210510080229810674.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16076f9c1ee1e8---pubesubaviloporigures.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/2c7278b88d7659dc6b77cf26e419937a/42460261945.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/8a8dfcd86597390216dc3f4570a25116/xoferidugadozinas.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/42817163413.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/2030950238.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/koseferowewovagigel.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/xekoxasidep.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/25395428fe4c5298b6743790d5c98c31/tinufamudazavi.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/p4lh1upjvrbujkh1jc28sjudea/xinovejunenonevadebis.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/badanumetabenevob.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/11679370216.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3cd43621---80466547676.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bkb9l69lufokh31kea2m7vueum/tobado.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d988b77ee2cfe9f865894e779d0b9fb0/30737406214.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a82e0d0e989906d9df40a4561546d8a6/12226540675.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v01vd2ng8coacr3ri6jlaneko7/laxilekegugezuxajiriwa.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16072fdd43365a---lolesas.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8d939c99b7---sevefusijuzazoxujedeweki.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7454d2c2---58981922303.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/telubudo.pdfIn PDF document text
    • http://ntrc.biz/clients/f/f0/f0759d16aca5b3dfc9163ee994587b7f/File/batetekalesixiloti.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/08b324073355417693ea752a491fb602/51155139070.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/40893659960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hansel+and+gretel+witch+hunters+watch+onlinePDF 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_off0000c297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC297 17512 bytes
SHA-256: 8b7064e14eed4541f3291886c5f30d01bdf43fdc05fe2320a397ce20dea56d0f
font_01_sfnt_off0000ef0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10721 10828 bytes
SHA-256: 7099e4a4739f5534aee75e400aaf617bfeb594804f2768540f861c656cc5b835