Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab9eb5a3ea460cab…

MALICIOUS

PDF

90.4 KB Created: 2021-07-24 01:34:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3fd664b1cf3ef79b7bc6fd063c1ce52e SHA-1: 7a2325344b4da43490d71282997b8b083a69a83b SHA-256: ab9eb5a3ea460cab603aa5a50e24c93e641a971d0f793b3d280325ae5b5c9747
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://angkorphotographyguide.com/userfiles/file/mitabetixovegige.pdf In PDF document text
    • http://lab4050.com/upload/editor/file/4013233777.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0j9or97m7m8cku288fplipbmn8/95733657620.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/19875940201.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/64316477167.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/xonowuxuwu.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/vujoromoxidevedubifazi.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/porobatudanumasedax.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/8cb1f4c8ff60e3b63f255182ee1027b9/97802871848.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/reruvejovi.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97ea46425f---81844481296.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/ginikunonurodopugojigir.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/bamakoxitidibefidabisa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/e7c155b97bd764b508efbd375f03eb7d/14775349757.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/71273271102.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/96327fcf32a450bdca06f2f175f50782/21790767794.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/misajusuredasewumiladoda.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-10/20210710144950633452.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g0kf1oce1gb6mj61flbs18jfkr/97342599680.pdfIn PDF document text
    • http://matras-devison.com/upload/file/21817690902.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a455d88c6---84917941285.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/234b14239c41b57dddaa1e1290e6c587/43415085978.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/fe5bsbqaoneeh0qfd9m8443s8i/38616747875.pdfIn PDF document text
    • http://zimaletto.com/uploads/file/73932989580.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f54d37eab---maditidijavumonepeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+know+if+a+matrix+is+in+row+reduced+formPDF link annotation
    • 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_off0000f828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF828 17660 bytes
SHA-256: 3192f1c06d8c7a19aabf7531a94ffda2db7c3a8d064e3e673b471bcd7568a681
font_01_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F2C 10960 bytes
SHA-256: 49f63c622ee61eff61c97d782b1b09f52794e060f57af487fe37d699aa3f4f37