Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f251fc2b3c9b530…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 19:05:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6898c7d69893b05ea0990d7d452cbb60 SHA-1: 70f6db500578d3cdad526e3a904cd6d76c9ea915 SHA-256: 4f251fc2b3c9b5308c49ed5d85ba3f05261341fa71408ce956fe76802d73cff8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://pixomot.ru/uplcv?utm_term=wentworth+season+7+episode+10+full+episode PDF link annotation
    • http://zekidilektekstil.com/images_upload/files/59526479131.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/nipuvotorewokufozes.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/20986008230.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rizenawulibuzudidasu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/98342491470.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/4b116c2e099cd36c048014be6dba94d3/33215523999.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/fumezitoxidadijije.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/34478557545.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/vakisumesedosutet.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/17193267084.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132be195e5f4---nefuzikenuwi.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/80921818223.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tonudufi.pdfIn PDF document text
    • http://abnicum.com/files/file/rekofelisalofafuj.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/90379210567.pdfIn PDF document text
    • https://lacausedeslivres.com/userfiles/file/73048846217.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352c438777c---25651061866.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/sotetedogiguxekukaxoko.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/nutefepe.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/ropixalegajugarorivizoru.pdfIn PDF document text
    • http://mcutech.net/files/julunemaguvobifoponuzike.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/wotovivifi.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/sajixusebofomuk.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/80707797641.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_off0000c0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F7 10996 bytes
SHA-256: 0f8b1201455c32481ddcf6b69ce2a6d383070fb6e7db402550bd0aa4241bc79c
font_01_sfnt_off0000da90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 16408 bytes
SHA-256: 57ebb8ff687b45d6989f7f9dbfcb60986b4822abb71a07146bdef954c61aae2b
font_02_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1