Malicious PDF — malware analysis report

Static analysis result for SHA-256 343fc0b300d223d0…

MALICIOUS

PDF

106.5 KB Created: 2021-07-15 23:19:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e4f52a252ebdfab6a40e7e2cba8ce29c SHA-1: fd697dd2a91100811f1add51e6fea7599bdefcb6 SHA-256: 343fc0b300d223d0b787e2e4f68470077b126e0dc60f16844d623b4eb2977ea4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised websites, many of which appear to be WordPress installations used for file hosting. The file's structure and the presence of these links suggest it is designed to redirect users to malicious content, likely for phishing or to download further malware. No scripts were extracted, but the overall pattern indicates a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=iso+ts+16949+requirements+pdf PDF link annotation
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c65ef03d7e---vafigekotizemizilosizopus.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/21389375602.pdfIn PDF document text
    • https://tongdaidoanhnghiep.com/app/webroot/upload/files/92657280103.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/teluj.pdfIn PDF document text
    • http://akademibt.com/resimler/files/zifejifopusirasamapuwiga.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8ae5c1c2e---8880366438.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/7357929628.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/8t8ta9mhvc620kk00md9k9ab3p/35588098142.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53e11ff93---45962263946.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a8a470f17---xokefuvokobafi.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6247ada3c1---xagapamexodijedijo.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b71292c81f03794dd7d9f1f1db18d264/lebul.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/87901776921.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e77fd391a---58286190680.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/muvesedagabebubiw.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/p4t8nsrtojhu60rc76db6hics2/58056329755.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc3283e40c---62346234048.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/36651481870.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5f0b1450---vudesetadasavuza.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/136599186860d32e064329d.pdfIn PDF document text
    • http://plastikacz.cz/soubory/files/pirivixixavowikobimosiki.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c171652ba4d---wadovunalijovuwuv.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/64536897707.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885b72392a9---tetiwekosuwiv.pdfIn PDF document text
    • 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_off00013ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000154fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FA 17496 bytes
SHA-256: d56d0f4363120f5359d88782770054a55f1b6c1b0b895527f4fb7bce0ff3f8c8
font_02_sfnt_off000182e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182E3 11116 bytes
SHA-256: c764b9738cf3eebabf800943403e014a0a90ee8df37609ae65a4cd77ef33b0d8

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