Malicious PDF — malware analysis report

Static analysis result for SHA-256 2583342d759d83c4…

MALICIOUS

PDF

84.4 KB Created: 2021-09-06 07:18:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6a628ad3d35748c660ae8322067f2001 SHA-1: 463de0f2da8625b9fd7528082a6e17c2007c8d44 SHA-256: 2583342d759d83c40ca2ab398dfcd116e3c6dd90ca1708e37832513b0d505b52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates this is a link farm designed to leverage disposable hosting, and the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature. The primary purpose appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://birnagarcollege.in/userfiles/file/laminesivajovej.pdf In PDF document text
    • http://allnatureint.com/userfiles/file/wijesujuxunit.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/malizabun.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/82477284639.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba15dc7c94---17037575891.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a764334e3c375ab2dcec3deed3299366/wifagirasegake.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2032182065---sadakosusefunul.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/5eff838f2be974b4e2d32f61a07a2c0c/suwemun.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/57829626741.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160e8cce06c0bf---nevarumejul.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210820212854.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/ifbal6mu221n7fluc6nmupf6p8/xopozopeval.pdfIn PDF document text
    • https://asken.as/bilder/file/95480603595.pdfIn PDF document text
    • http://jaatkinson.com/userimages/fefamuvebukoduvabitejus.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae03eef6e6---gutikexubaxapivilotonadej.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/69297202384.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a50cf1dd33a---kafogeda.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6d7d78ce12a27dd49fcdf43bebaeb0f8/wufojurupavisirepasozizu.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/98015294385.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-4/20210504075657291919.pdfIn PDF document text
    • https://davaocarrental.com/images/file/dizapoloxibiligoduxomatoj.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/9050167687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=verbos+defectivos+en+ingles+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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 10808 bytes
SHA-256: bde6776be0ab1ceec8bbd7494964c41735161ce68979995abfc965f428824423
font_01_sfnt_off0000f74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5F 20340 bytes
SHA-256: 479c90b768143b13d68680e2d9c3219eca654e6f17f48e65f96419230ef38af0

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