Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36e6a3c7d1103d9…

MALICIOUS

PDF

100.2 KB Created: 2021-09-13 13:38:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 946ae14ee597fd788086190fadfd37c0 SHA-1: 5bef4b066a3934b507cbee644500cff3561f5157 SHA-256: b36e6a3c7d1103d9fe399872c626b5319eb34b9ed65fe8de877eab7fc5ecf5d7
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress upload storage, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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://imagebrandstudio.com/userfiles/file/10757151729.pdf In PDF document text
    • https://halkum.rs/files/11919022783.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/zejusal.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/59051425378.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/44324306311.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/73064401824.pdfIn PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/53099811375.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/mugupibawalefelutawolozuz.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/68440757477.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/29723920494.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161367d9575432---juwosedekelurefemujoxarok.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/or4f6929cm6rrck3q4a45eehh4/mimor.pdfIn PDF document text
    • https://coevent.ru/upload/files/59947437324.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/juvofotikuvezi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/568621243.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/jezorirogelomezavor.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb7c0b02a5---13667885926.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d10066883---62548401708.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/60165290153.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/44499450636.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ae1236a5e2db90dbf5420fa3bac30d66/84638751040.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/37357592779.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210909_AD2C58415C0D5D67.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=android+studio+emulator+tutorialPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6B 10488 bytes
SHA-256: 34e5465672e6ec82d6c729b880d35ae8bcae62c6619845304d55ffe699454bdd
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 16536 bytes
SHA-256: 4a19152f52583789ae098f7ea75ac03a932e3ad17d9734a1682ea1d3368d108b
font_02_sfnt_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 23668 bytes
SHA-256: 858e9a706a3730638c613035099c7669c19057c551019ad425e9fed5fa40bf45

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