Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c40fd4297512670…

MALICIOUS

PDF

105.9 KB Created: 2021-08-03 11:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 542c42a30f3ad9b80252fee7d48502f8 SHA-1: bf998a600fc60a5e5afd7a37b64ac2cbac450bc3 SHA-256: 1c40fd4297512670114ee33ea678b7e6fad9beb2e5e66301ca8766b796619999
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://philabc.ru/uplcv?utm_term=poeta+en+nueva+york+federico+garcia+lorca+pdf PDF link annotation
    • http://gloucesterclassof81.com/clients/23558/File/98102662567.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e62465e26---28832025991.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/307cf6fce43e40af225805ef378035e1/diwakarojukuz.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/delinakajuvosatoxoti.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/8994307d0eea0cb34316b1687e1586bd/deropefuzudo.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/11191241148.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/d8dc927a8b6ad2c1eaac0b992bd54ab3/gowoxofiwexuwokudaxo.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/df79dfbb83fbd09668448e1446a233f7/26914856922.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608141999a8c3---98113571973.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d23f91533e---79447784566.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/8368449489.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/c6ab1a551db28192a5670b8bae8349c9/juladibep.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a92eac6c---45278224798.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/faxumebivowe.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/3932607789.pdfIn PDF document text
    • http://zae.me/datafiles/file/naduvevinozalubawe.pdfIn PDF document text
    • http://demirlermetal.com/resimler/files/15701809546.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/24857065531.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/62484302657.pdfIn PDF document text
    • http://mopron.ru/upload/files/wopeposadugodiku.pdfIn PDF document text
    • http://weiken-rc.com/upload/files/54694988305.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16074564c24939---toxiguxomatud.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/sanulunemimubowawogo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000135b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135B1 11000 bytes
SHA-256: e8487374cb6460e5a30a4f8c0376454c1593d6c994396ed14ae59c7dd4dd0546
font_01_sfnt_off00014f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16749 19092 bytes
SHA-256: ede25a66263db40cbe72f3e82742112015d42cfac4453b6482e87e14fda48562

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