Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b577f26dd765df…

MALICIOUS

PDF

81.3 KB Created: 2021-08-26 05:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0595a79f6152f8fee729d8b983bfb4be SHA-1: 57247c96b3ea7d15e837e17bf48aacb581443006 SHA-256: 98b577f26dd765dffca17345859d97d76856ea6ae73305baa52fbb3bee4ce025
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://vtvxm.vn/userfiles/file/57895159994.pdf In PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/efdb3f4febd53ad4b7d86768ac4cfbb2/26857456114.pdfIn PDF document text
    • https://ahha.az/userfiles/file/44944820684.pdfIn PDF document text
    • http://parishad1925.org/ckfinder/userfiles/files/83471578158.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/2dq0c5g4o7oe0uo3v347od1qp8/77052702030.pdfIn PDF document text
    • http://vivalepurrexotics.com/clients/2/2f/2f65fe2011b8f0b07f64c29a74835a02/File/18741776854.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a134f462e04---17902511870.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/50022967869.pdfIn PDF document text
    • http://tai-group.com/upload/files/kimoseb.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/tipogosili.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/7937395142.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceb7145b81---jasafasexijoj.pdfIn PDF document text
    • http://skikk.be/app/webroot/files/userfiles/files/17362202332.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/juvimexewu.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/sedorizudir.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/7adhfo1o0uqaljaee7tiro1fe1/65781825816.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/71224187530.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a1091a7da---45017206741.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160929e72973a8---kafikeviwaz.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/vanutetivuja.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/tebafuzuxalujomit.pdfIn PDF document text
    • https://promise-land.com/upload/file/gasidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=chess+name+of+piecesPDF 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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF682 10532 bytes
SHA-256: 2c6b336f2852d8b8f1ae8431731c725c19dc5264f3bda255e2c6bb47575c6bc1
font_02_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 16164 bytes
SHA-256: 413cdd76d0051c48a3fb68d4a964111e4c2c55a21f6e1287deb3bb4cac56e7a4

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