Malicious PDF — malware analysis report

Static analysis result for SHA-256 36cc825f8a711e39…

MALICIOUS

PDF

80.3 KB Created: 2021-08-29 08:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b7c059513d767fd5f5a88e5dfcdcad76 SHA-1: 33b68909126ef243f1ce487dfa6baa431d632a81 SHA-256: 36cc825f8a711e396090dd6ad6d4de817917792a74eb01dc11238b86c0c736fb
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607be7c0bbe55---tuviwugozinebedovefalitos.pdf In PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e6b78ddd7---35060413836.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb83e0ae31---rofirewegigoj.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce9470b2a6---levivisirale.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cc2c8950f---supenitimazokabaduzepem.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/2j5s7sqqqg0c3drhi7v7p7cvtf/sazomamizufiguwepanepen.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5c9478a9d102e1a682b8363643d974b3/89476138345.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b915a6bb0---71102015718.pdfIn PDF document text
    • https://businessservicesuk.com/userfiles/file/pevubiju.pdfIn PDF document text
    • http://midel.me/userfiles/file/6767638874.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610820f3ebcf4---67227482527.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/mepituselasibixaxozurag.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/gitomo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1611544fe8e8e5---34135394263.pdfIn PDF document text
    • https://amblamy.ee/upload/file/rilozevofen.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/79517772100.pdfIn PDF document text
    • https://tailormade-sales-marketing.com/userfiles/file/budatobilanolazotebuti.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/17555095858.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/23d1c03f12edf87c3136a4cf2efe7035/81464956247.pdfIn PDF document text
    • http://meta-min.com/files/46843023933.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210828_235547.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160718ddbcd0bd---vuzag.pdfPDF link annotation
    • http://acecaalcoy.com/userfiles/file/35494994736.pdfIn PDF document text
    • https://habibitours.net/ckfinder/userfiles/files/zuburefimasafolu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=enhanced+oil+recovery+book+pdfPDF 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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10844 bytes
SHA-256: 1ca1c8c69057ba6fd775d5f16a99d984caccc7592432cc1200d8567859fd8a75
font_02_sfnt_off00010854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10854 16728 bytes
SHA-256: fd488ac6277fb1cd7d5a43c1fdd09e14624b95dcec817cada47592c670c6ec46

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