Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fdc1e24d6b95f5…

MALICIOUS

PDF

89.2 KB Created: 2021-07-31 21:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6cd0b3107b341d0745a40ea2a08dbd47 SHA-1: 05d514c5ddd6f030c31a0546299b108f53cbc66d SHA-256: 65fdc1e24d6b95f557f7d0768babdee5693520d284b020b72983d6243a97bb65
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of external URIs and the nature of the heuristics indicate a likely attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/4d19b68a1f0b44dce476c78b10475ec8/35281473375.pdf In PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/12401075096.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a451ecc84cb---48433288744.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/jepuvugap.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/dd6d591bb058bbee6d2ca0b24d48dee5/82730526334.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/89819674262.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sapekutowifaxavisexiga.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/c4065e024b08289ac46d46fb524afbd1/bufapafipotadetozapig.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/8181219500.pdfIn PDF document text
    • https://healthcareadvisorsgroup.com/wp-content/plugins/super-forms/uploads/php/files/hboeeccfa1v4mfrg1seb9c6dj7/54447795753.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b035260028b---83446064569.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/78933990264.pdfIn PDF document text
    • http://keysrotary.com/clients/d/da/da683cbc30bfd632b0b364d14bdd38fd/File/46371895658.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/c1225eb53e2a18da45ce62e8caa41f21/puxox.pdfIn PDF document text
    • http://nccutrackandfieldalumniandfriends.com/clients/2/2c/2cea5a7e730406ee40dfbbde6098010c/File/88284375600.pdfIn PDF document text
    • http://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/lepufuvulusotoxuzo.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072733733b4c---depuwemakazosip.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5b68d858ff---lumotimevom.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea91e21c6f---72395761746.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/90865241913.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8e9605ac5---zovirake.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/39049647249.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160919dfe193f9---6412050110.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088ad1f775df---vazodegexabalivuwubi.pdfIn PDF document text
    • https://sinarwaja.com/account/files/gadudazelugexemonunoxen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=tabla+de+conversion+de+pulgadas+a+milimetros+en+llavesPDF 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_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 11128 bytes
SHA-256: 78794bd2c71456f081f592bddb0f5b8015f9b72a647cb3978b16ae3046f9682d
font_01_sfnt_off00010fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE6 18232 bytes
SHA-256: cb9a2c6c0a6701b00f61b5c0af4e88f2035ffc2c344d0a4b503a78d2bfc8380e
font_02_sfnt_off00013dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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