Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4ead047b64c3132…

MALICIOUS

PDF

71.7 KB Created: 2021-09-21 12:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c77db3b6bc0b3257a7b3f616f39dbdc SHA-1: 749fa11890290d60f8729fb7ceee0c7e7443e3e8 SHA-256: f4ead047b64c31320294e1a94b1edda3eda5f1a9ac7f9d03faa755220df4f2e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of 'utm_term' parameters in some URLs indicates a potential phishing or SEO manipulation tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=mobogenie+android+app+download PDF link annotation
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/8058073599.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161499525d1474---paxawu.pdfIn PDF document text
    • http://otevrel.eu/ckfinder/userfiles/files/pasuruputilomopubesupuz.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/77949954302.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca9d1aa3---45597235062.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/dububowoxusub.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/detujiguzepavuxafufarazi.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141a766bb268---46630231083.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/78489539509.pdfIn PDF document text
    • http://risme.vn/files/87709621101.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/10427246493.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/20407347921.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e82a2f9ca---39161438800.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/xexigukupuvipopo.pdfIn PDF document text
    • http://lanaecoloridabruzzo.it/userfiles/file/23236603781.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/disulejizulokuserunigowap.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ff8d67b8f---juwazikoruralolazuwo.pdfIn PDF document text
    • http://korytnica.net/data/files/67424634935.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/janatusilamerekiko.pdfIn PDF document text
    • http://gibisch.info/files/files/futitex.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/38035835040.pdfIn PDF document text
    • http://deforma.it/userfiles/files/xusef.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/tidudedatupiduriguvixoguj.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/wovivapigutu.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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10520 bytes
SHA-256: 33586bf8484479c324b628da81d9ad40287ed19795c42bd252fe0713424abc34
font_01_sfnt_off0000cf46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF46 16560 bytes
SHA-256: 9a6d23393b53f8d009cf237cacf15d87f9992c75440124c1ee276a457d7d5079
font_02_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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