Malicious PDF — malware analysis report

Static analysis result for SHA-256 331f1d5982f82625…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 01:57:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b6bba80934f9908dd72c111fe9ce05a5 SHA-1: 27184cc39e0215469e15bf96449d209a88080b6f SHA-256: 331f1d5982f826259543ad73ba86f5cadc0be8905dcb4eeb4954b8e2d484797f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of these links, combined with the PDF structure, indicates an attempt to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://philabc.ru/uplcv?utm_term=good+will+hunting+movie+script+pdf PDF link annotation
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/insfbsc5nsa61h5i244oc4ttu0/netowetesile.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/a46411a21b0b3616ed52dff91831ea7a/7215681709.pdfIn PDF document text
    • https://quaint-house.com/images/blog//file/larikulubegorore.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9bc90bee7---58749538046.pdfIn PDF document text
    • https://reha.bg/content/upload/file/torugogogogogoreba.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/3253567907.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a7c7676b0---robojivexavobijapolomuz.pdfIn PDF document text
    • https://primer-spb.ru/files/files/xezarumozamolikeliruzavir.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff921a93b9---74313464704.pdfIn PDF document text
    • http://videlec.be/ressource/file/36981159618.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/94960255786.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/fijewiragevisigipigakiv.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a11097866ef---32523615646.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16125337347491---32081365288.pdfIn PDF document text
    • https://cardolf.ro/files/niwikuwi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/a9280797cce0a0b7bd07590131cfbc79/58457779331.pdfIn PDF document text
    • https://kermanrooz.com/img/files/63699969315.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d929384995a---jowatawodazupomijuloxa.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/sabuwezapumarosetuvijup.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/65206483989.pdfIn PDF document text
    • 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_off0000e993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE993 11196 bytes
SHA-256: 94b2f170d250f7c582231029fe74418c50597a5376aff568796a41eea26873cf
font_01_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 17496 bytes
SHA-256: c5caaf4b1f0689fd7aa74002406e06c6362e6467a61de109cd7d1c6fddd500e8

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