Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc98220c6be4fac9…

MALICIOUS

PDF

69.5 KB Created: 2021-09-19 18:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 646add299e7376360c379a770fee2a0b SHA-1: 5952fa3856341050709ea08a12e75b23651fb093 SHA-256: bc98220c6be4fac9cf91041ceae155a29846f0e35b55021e9f1d19a5f273013b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress sites and disposable domains, forming a link farm. These links are likely intended to redirect users to phishing or malicious content, a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=io+games+io PDF link annotation
    • https://ms02bet.net/contents/files/nusaxizixekuvubifevop.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/25e376a602f88a8d768fb22d1d26a0f1/lojelexaxetipox.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/42653781391.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/wudesidotagematojixef.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140272e12c5a---1694709003.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/57277292428.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae5347e1f5---rujufafitadudemofubevorar.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161364bf8aca46---43121786470.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133bb4a93eea---94047505105.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/gotabivugokurozafuvuw.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/86690523709.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/64524112220.pdfIn PDF document text
    • https://hglobaltourb2c.com/FileData/ckfinder/files/20210904_B1F92F65058C7CEE.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/vupovulujizewasejejubeku.pdfIn PDF document text
    • https://coluer.ir/documents/file/zajugifasixakawegajo.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/gividewosigenanagotane.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/wepasuvoxepamusal.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/tutazavedekifidipen.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/zawesamazerulu.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/93706105877.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/nojaletejisiviwejok.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/vasaroxilebotovekodel.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/82849844990.pdfIn PDF document text
    • 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_off0000b408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB408 15004 bytes
SHA-256: cd806c19b5dd6a5c8e8fb223cdf70a5455ff625f71fe4eb7deb67b38a50ae10f
font_01_sfnt_off0000da11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA11 10056 bytes
SHA-256: c2bd469561f36a592a53646958016d6e0f092c9ce6df7c2c4337773e6ee3d598
font_02_sfnt_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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