Malicious PDF — malware analysis report

Static analysis result for SHA-256 26f686388b1631d4…

MALICIOUS

PDF

78.2 KB Created: 2021-09-05 12:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69a0d51a176e200fd82865bb9bcf3dce SHA-1: 70162a457616c9c9d600618cd0b609835c8df8a9 SHA-256: 26f686388b1631d40e81b49b90fc4583dd9dd2301922349fb40cfcf7cc80a140
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier also strongly indicated maliciousness. The primary attack pattern observed is the use of a link farm to lure victims to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160705e53074b3---notonagutunob.pdf In PDF document text
    • http://onlineexpert.in/userfiles/file/xokomej.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/h8hsvpmk866dpq9d43cfbspj48/zomotatexurexabuwog.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/b2cb6d8f3dccb88226b19e131d6ac2fb/gataxafovupil.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1ebcf2a1d---bexazuwodore.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/l4871ot28r6nt9jid6nivjifc8/renidilezuza.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/0fin92193dqvoq61d71sgis61s/jutene.pdfIn PDF document text
    • http://elesud.it/img_pagine/file/36276660088.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/kopibipojaduguxaje.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ea7h64i6633e3h7o4j5qdjvue8/kogozibun.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/63684354702.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/38209334889.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090024bdc20f---pabonepemoxu.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a62a7ca3f2a923c70c6007d908bb414b/90859739397.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/lin5nver2hbrrk9vs5tfg91kdd/feredosorirofel.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/pewurikurodejepuwe.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072be57f142a---11651726989.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f2b02d47ba5---ridezojedajepiruwenagawaf.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/kufiredevigaf.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/161174af6ae422---savemedosujogudut.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612cafcf79ecd---21436645768.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/98330666860.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb4ef422f1---87526643102.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=screwdriver+types+pdfPDF 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_off0000cce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE1 17820 bytes
SHA-256: 1a6c1188f4f309732287b5dd6188cd81aa05c98a2549e929c6a4c73958739ba1
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11335 10520 bytes
SHA-256: 43e0499bb82261ad4dbc92b6d20dbf429abbc489f30c581c3a82998c40921dbf

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