Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ed5ff56b2bcdc1f…

MALICIOUS

PDF

88.0 KB Created: 2021-09-04 12:47:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 63d423412b06dfca07423342b49c76ad SHA-1: f8480e22641a1fae059e28025b265243114d3733 SHA-256: 0ed5ff56b2bcdc1f8317b5326725b28080b0849031f6a4ca00697509fdd4a8c5
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to lure users to malicious content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://mrukseo.pl/userfiles/file/81381962215.pdf In PDF document text
    • https://betalinktech.com/blmedia/file/79499650409.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/pogemip.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff80e17cf325b2f14bfe324d2e0be02c/jitotifawaxuz.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h8con9b2pu0elci6mlbt7tv647/xulozirobazosimem.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611e448a93760---videtakolugalixurebuvuwu.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/xanujigowekidopibopewoxik.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d267fdab95872dd66e899763c49f8acd/legaban.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/17776004288.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/lakoxoxexokonavosob.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/86580825265.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/7452278788.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/25078147667.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a4e41a776---19395403530.pdfIn PDF document text
    • https://medtek.vn/storage/file/zebofonosajufipidi.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/60991981656.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/mudaduvunirosenafita.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b9f31829---16036629253.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/teguzakukatibupenotewuwas.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160980c4f0af99---5235337325.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f33983e3ee4---66115430875.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f423ed063e6---93743505244.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/wafixomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=vw+amarok+v6+core+manualPDF 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_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C85 17772 bytes
SHA-256: 4aba1765a0cbdf91f11eb7a52fce123b71198d864198b5f2a09336437788a7c8
font_02_sfnt_off00013a5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5B 10516 bytes
SHA-256: 74be994c79cd919703fecb879d9858e40ff883739098fcbc4e9ac2188c66d109