Malicious PDF — malware analysis report

Static analysis result for SHA-256 498288d7ce95683e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 14:13:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a94ceb0cc85a83cf9ce5b71ad22745cc SHA-1: 4fcb85c8e971a9b2584fbe313afe251e2fe61d90 SHA-256: 498288d7ce95683ef3f4dec5b14c3d413f0a26c9b2e04f426796b980451a4d14
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic further supports the classification as a malicious document, likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607cde37b4f34---30244942298.pdf In PDF document text
    • https://cuacuonbentre.com/upload/files/luvijezipara.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/37334773438.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cec85a4f3ff---77495760730.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e19de5d9e9---lumavub.pdfIn PDF document text
    • http://dgjst.com/upfile/file/35424276527.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/1fsdffgs9jflmm1f1h1956pn0l/81590377298.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6c7e492a5---kivinij.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084feccbc5ae---bogap.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/71988702297.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb0f51c950---38624379081.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/84775577828.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/lubugujas.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/35296325675.pdfIn PDF document text
    • http://185.33.116.142/~bbyacht01/upload/files/28573860182.pdfPDF link annotation
    • https://textosolutionslinguistiques.ca/upload/editor/file/tefujigakafusozesevi.pdfIn PDF document text
    • http://absigorta.come/file/24598029455.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/vafog.pdfIn PDF document text
    • http://apexhealthnutrition.com/newerac2c/userfiles/file/85870055587.pdfIn PDF document text
    • https://stvorki.ru/files/file/12550320127.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161035bdfae3c9---sisolipomasur.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/wowenabe.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/kolalazogogavuneginola.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/51e4963603ba18d0f096b2cabe4e9179/kibexosijekegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mochachos+menu+pdf+2018PDF 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_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EC 20652 bytes
SHA-256: fe9b2b4ce197fd6900ea1e7bc30a220a1f30f04958cb001dd795bf2887431b3c
font_02_sfnt_off00012c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C67 11144 bytes
SHA-256: ed8e6ad581a8be729794b1cd82b113464390ea9dabc939471eb2415c35e46151

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