Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6037ec544cece65…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 14:24:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c54a115b6ebe2f7c122b2052c630ac3a SHA-1: 30f8aa4f07a7fa23961441e62f7de4840c9d1786 SHA-256: f6037ec544cece6517bc0575e9fc221bb639ca8b799e9be3725291c985536fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to lead users to these compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://garglob.ru/uplcv?utm_term=volcanoes+fun+facts+worksheet PDF link annotation
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/3eb0p3atgrmb2aalqns0cpv9ne/folinatidafut.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b4455fa84---fevapake.pdfIn PDF document text
    • https://isosklo.cz./uploads/tumomipoxotuzufobanibufa.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070b5fb5dc0b---pigekokovavubukukerak.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/48860798068.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/40374715622.pdfIn PDF document text
    • https://spacio.hk/attachment/file/20218201148.pdfIn PDF document text
    • https://www.clinicaepilepsia.cl/ckfinder/userfiles/files/futisenowokeporik.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/tapexofanu.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcbdc38b3a---42054593339.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/41440416206.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9779c240c9---jetaloboriwax.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/365j8ectecdbseg2g1eu69nuqn/57282680649.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/98061094328.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/1789dfaef71ad3a624d39911c3512498/85317662073.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vcq1ato3gso4sbr04t34sl01ks/kopaxubemoxizutaw.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/fovevisaduvesozetikokufu.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c711b0e7cf4---varix.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/73410202449.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/vinavod.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/f4rsjt5ep4f9uti6e978p6ohci/nimadewade.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/74058417734.pdfIn PDF document text
    • http://stolocatering.ca/clients/874514/File/dopukaxiwe.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/32557930795.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113fe85ae9f0---lopogopijutivekorab.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_off0000dba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA9 10588 bytes
SHA-256: 3e88e9dc4ad05431c3042b7c11f661ce0a1ba73a8dd2b430b679b7da786f716d
font_01_sfnt_off0000f3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 17756 bytes
SHA-256: 7eb455f41ae96574a94adc8c20fcf2a8142021a877c5f5cb90a47e8eb7077edc
font_02_sfnt_off0001219e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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