Malicious PDF — malware analysis report

Static analysis result for SHA-256 944a286ff3a36a3d…

MALICIOUS

PDF

89.5 KB Created: 2021-06-30 09:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0cd56e62cf9f54f48f3d771fcfcf0168 SHA-1: 60c30e822a8392938eb40cd545931ccc62b4cde8 SHA-256: 944a286ff3a36a3da98027a088b775270ae5e2b11d336b8c94fc0d74ba9effe4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware hosting sites. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised CMS upload storage for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://architettoseneca.com/userfiles/files/78187556518.pdf In PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/cd0530d82e259ae0a14e0cc1305ad256/41429582858.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a85e9162f---10468642169.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201952984668.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ruccc5ce8cvk49g35cteb7cvc7/nafivajubujazekotogumu.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/97746937451.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/19902218133.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcc5721d80---piwuzofo.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/72247195066.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/415f135e82e760978916cacd30b22f38/31756887745.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/a444724bc2943fa8f40621e7f58b1183/duzoridupake.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c77eb125284---48735021145.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/lamixupopura.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5992860885---64275767928.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cebfc0afd---nawadanipitojeroselewona.pdfIn PDF document text
    • https://proxus.nl/file/nasexenewozodevobexasogin.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b372cee6f4---nedotimubifegil.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kepowujiwafuz.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/fatozogerixakemixiru.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfacd6c722---poviduvagijomizidedobume.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/23475a61dc5a4bbb436542c0a6da95b9/70578968779.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a67bf8903de---fexumepifajumazasijawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+my+philosophyPDF 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_off0000fdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E7 10288 bytes
SHA-256: 6aa597c54f43992a6b2e0a67234de27a617110f6a1cb7317a5ad99660dc0c49d
font_02_sfnt_off00012d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D14 16944 bytes
SHA-256: 5a1601d380413eea70a4c70b20e8eb77936aa528bce296c1ca3aa282b9976e60

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