Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ff477ceeaee2ab3…

MALICIOUS

PDF

76.1 KB Created: 2021-09-04 11:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0803861346c98ef8f43cc81f46cff5a5 SHA-1: f163ec472961682e5b993681a782c27b749abba5 SHA-256: 8ff477ceeaee2ab35f635bec66559ab92ba077db9e32721bde84d57092f593ca
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites and other unknown domains, suggesting a link farm used for phishing or distributing further malware. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces this, indicating the document's primary function is to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1qh0qb3i7rciq19c1454u6uekf/lapivakiremo.pdf In PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731484a6550---xubitaralewapotavetozurud.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/vikowavixamopakize.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/59526122345.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/8528085075.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/a515d9e3c1339949538cd719201810ec/85737048200.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/31032310269.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/batotanadas.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/8e5a1ea607de7469039bbb98634c6a3b/68988771531.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f53c53140---49670617804.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/zamutugenijojipavomux.pdfIn PDF document text
    • http://ok-poland.com/userfiles/file/1390660627.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d8cf94014f6---64216913667.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5bd1adc4---xeledaranepisa.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/woxekolevudasubebi.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716d453d4b1---welejajupemejoku.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d36a279be7---fabebenuku.pdfIn PDF document text
    • http://djarkitek.com/temp/vinney/HTML/userfiles/file/kuxebuxevurebo.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/xipobotikepuzatofoxo.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160fb6fc55efb7---29349064200.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6bbd571e9610ab4857a5ef2100dfced5/78275235940.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/vubuzadapev.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/49533282834.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff37ee31f45---95988327543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=2001+pontiac+sunfire+repair+manual+freePDF 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_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 10936 bytes
SHA-256: e3f4eed40b544abafa736cb24419a398edc6480b1fa804c27e51304f6685d1b2
font_01_sfnt_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF601 17328 bytes
SHA-256: 7d0003aabac275521abf86bb6f82beca8519973925843da850ae6ecbf6f2b7fe

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