Malicious PDF — malware analysis report

Static analysis result for SHA-256 d53b79759adc49ae…

MALICIOUS

PDF

70.7 KB Created: 2021-09-29 12:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: bd3569116d3f56676e9bc13e9f506172 SHA-1: 6761474c36cd9abd06fcca68da043e8b4308e904 SHA-256: d53b79759adc49aeb21b720b2119bee79a6701508059e10ab329f58bf81d8ed7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://drafthe.ru/uplcv?utm_term=delete+thumbnails+android PDF link annotation
    • http://evola.it/userfiles/files/gafibewimo.pdfIn PDF document text
    • https://orrizon.ru/images/file/gidezokawesowawa.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/5064662381.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/38523804409.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tetolikagexa.pdfIn PDF document text
    • http://dgelc.com/userfiles/file/20210927210140.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/vuferusonujupanukod.pdfIn PDF document text
    • https://strechybenesov.cz/content/56335145396.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/68477916942.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/83574855361.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/medobilodexazakan.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/33141461211.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/petuzuba.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/taluxez.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/vasimomalakurap.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/26053799090.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d121244c7a---67269766349.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • http://jamalcar.com/userfiles/file/nibevopigobomigofawugo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613a899b1766c---miwufejuxezikogu.pdfIn PDF document text
    • https://euinsuti.ro/app/webroot/files/userfiles/files/93625126729.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/79845566772.pdfIn PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/36721692044.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/lafuvesuxagasubug.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/vimodejopomitagujuxu.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/71300918623.pdfIn PDF document text
    • http://d-innovation.com/upload/files/75342063616.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c978182665---tisemawizoviti.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_off0000b6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E9 14740 bytes
SHA-256: 6d8d3e0b7e150eaf5c0c4218b988b9d4b9c2a38ee6bade51eb525b2718a22a7b
font_01_sfnt_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 10752 bytes
SHA-256: b549acad18a079083e9c92ede6823fe5888fdf2921e634c81ca5e225e0c1f6ff

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