Malicious PDF — malware analysis report

Static analysis result for SHA-256 5662f0b0f37fbd32…

MALICIOUS

PDF

150.7 KB Created: 2021-09-02 13:53:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: f7656d7c1ea2c29595bc6d86e8b26410 SHA-1: 0ca7af56b3c89c7caf73273c0aeffd8b63cf9551 SHA-256: 5662f0b0f37fbd32870b368034f06d4a024c2754ca990b3f817686f0dc067c59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

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://kristiankutschera.de/userfiles/file/39920092741.pdf In PDF document text
    • http://icmasistemas.com/userfiles/files/tijofufi.pdfIn PDF document text
    • https://aljazeerahdrilling.com/userfiles/files/waxoridatowokamogelovoki.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757e5a3326b---rudaguneru.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dab1a6bfc---xedav.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/wakinexubiwixetaregisegin.pdfIn PDF document text
    • https://klairtransport.com/uploads/files/tubebasekoxuwuw.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e4e16105b---busolanodufo.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/41154586511.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a4b18117---sujizedatu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1dfd76445c09b899a32d6a60510113bb/zexukoxab.pdfIn PDF document text
    • http://fairmonteast1975.com/clients/0/01/014dde3c838f86fef2ac1d31a86c415b/File/96527809352.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/rizenetozexebir.pdfIn PDF document text
    • http://dzbnf.com/upload/file///74433242478.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e8bb2bf84289145440cf9b03cff13f36/53463342181.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/4cn6dscljvt0rk5rnesobhc7i7/tuliratalufijejirikigi.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/2ee2f0424e745f830cd3fd478d9eb373/nofodulugun.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080acde0100b---duginodakonuwojerupum.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/24089882920.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162506373632568563412.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611e2c137aa02---sinixogavawip.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8438abab6---1558008463.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b743f65a12---20639251908.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/41801163463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=pragmatism+philosophy+in+research+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_off0001e457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E457 11184 bytes
SHA-256: 30acffb515d014af1672810c02e5f937ffa077274576f3570a2f0e8953940b49
font_01_sfnt_off0001fe1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE1E 21104 bytes
SHA-256: 776bbbc7d81a298bb99f64c20c78a56793f148c913c7018eeaf54095434ebe4f
font_02_sfnt_off00023513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1