Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb74d244f5417d3…

MALICIOUS

PDF

92.0 KB Created: 2021-09-17 06:59:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 92cbd4b7cd8b56e9250235a51419a926 SHA-1: a9d05a7caa0170658e8e45d079662fe7d1488250 SHA-256: 0eb74d244f5417d399e3748c24a7ff2804c7fa6f10a4c0b08b99427988f4fbe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, so the primary attack vector appears to be social engineering through the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://ms01bet.net/contents/files/luworu.pdf In PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e042a70ce---41583751543.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/riwez.pdfIn PDF document text
    • https://linardi.ru/files/file/96728014289.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/8617851883.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/90993710034.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/korewekazojobuniw.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/gidajalezuvepojomatu.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/44990489960.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/tifowavixamidujobuga.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/vewasumezape.pdfIn PDF document text
    • https://halkum.rs/files/2482849132.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/duvesosudi.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d9f394a3---zukadefivele.pdfIn PDF document text
    • https://demetraproject.eu/ckfinder/userfiles/files/kubotalamiwedorodufam.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae794168d7---38387090381.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/47295578295.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/66460552507.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/xuzibarujokirekaw.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea166b0bd---febudurofalojedapozufi.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/finasitigedanexujun.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/kabozadaneno.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/5elfueuf2h7cvrh4jb4jnol846/rudupawomar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=android+1+dream+league+19PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE122 16148 bytes
SHA-256: b17e3c388ca520c70044df51a505a8c8de3d1ca9b2e495c629779bc8d31aca59
font_01_sfnt_off0000f6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AD 22868 bytes
SHA-256: fee4c8dc340b1a4f404db1b147f9d6fea57a1f3eb0f711e70cf6d49fe86b1b6a
font_02_sfnt_off000131b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C9 10628 bytes
SHA-256: dd1429a03e75321ee749afb627467d008d22f88ce1f39b9f464b0333089006cf

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