Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79f528f1d0c9c57…

MALICIOUS

PDF

90.5 KB Created: 2021-07-03 20:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0bcb9a3a014acbc7f2290a27a1bd6d4e SHA-1: c302e7da873174b3fafb7b36032109e513f6c7e9 SHA-256: b79f528f1d0c9c57a03b3c6c91cb21bb282d451e4665554d7239740c5fad513e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains, likely to facilitate the download of a second-stage payload. The presence of embedded URLs and the 'download button' heuristic further support its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/9a3a14bf06be06329d7ec964ce27b30b/kanurataxigunalolebiju.pdf In PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79dc649f77---wamumuje.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a574c0a38---72755676320.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/sevabi.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/0adcjsanbdmkogjngdgngkfdp7/4822859831.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4e1e5281100c5d1c02323bf42e984ed7/sukadenekezodasifi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608773bcb974a---mijiwasefemuvepiza.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c295bc393a6---lusivitekufekevu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077a170cba9d---rufafowipaxelevu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a23677fa8---39454755096.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/33896908007.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/3175402423.pdfIn PDF document text
    • http://elijahlaurabishopblack.com/clients/b/be/bed082b287f5bb70db4763ab929fc18a/File/savemegazojederizegefok.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca613e945e---63714020519.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/plsqdc3pvskm4isi1j3udot5vj/68650060680.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/poziluvenafasunav.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b570a44ba52---24578392468.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/44519690246.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074fe134e01d---jewazakanejevazemaxifo.pdfIn PDF document text
    • https://andrejc.si/files/file/wegijovekodep.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770e3c4cd0f---xozuxisiz.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/bj336861fgdlr4t2nb5mhv52h0/dotigosifu.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/temusedojaleva.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a1602846c6b---jekugirebewurojix.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/fnvcp9tg1g0bae96t249boilb8/xotewimunegidozamidexosa.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/17607000583.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=ghd+sports+tv+latest+versionPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 17980 bytes
SHA-256: 615fcae5e178128dd6b6e7e357ba921c7768e387e57f7c64663829398e1136c5
font_01_sfnt_off00012cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAB 10596 bytes
SHA-256: 2bec9fa55a03e6047fdc896cd5d0a9a4f395b52e3f1dd63520873744963b07d2
font_02_sfnt_off000144d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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