Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb386b53a074fbf…

MALICIOUS

PDF

79.8 KB Created: 2021-09-05 23:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 15d29893ac39c96d9ba2327459268db6 SHA-1: 9ca5a08e59684e8b2e094ee7d85756d8cded9f1c SHA-256: 8eb386b53a074fbf819aaf52faab824a8d30b415e96c2cde78c80e6e44a1a465
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous URLs, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://berallebags.com/UploadFiles/FCKeditor/20210625234836.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd1eb6c975---67288132038.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/4f392f4c3fb164975feda8660b72da0e/820401025.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/273e0036cb2bfea01ca4a9fde0a749df/62661215932.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aae7719c6d5---xapebaredo.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b025b2da0bd---fetuzus.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/67022571417.pdfIn PDF document text
    • http://rhodium.vn/uploads/news_file/fuzenewumixamegotefukod.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/50249383266.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/9684962521.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/79975887046.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de496023b9---90871150728.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210508085440551.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/f70df13b23e0b49fbbfb1c88d3e0eae5/64205066788.pdfIn PDF document text
    • http://www.celso.org/download/xonede.pdfIn PDF document text
    • https://webmenuplus.com/images/file/73590124922.pdfIn PDF document text
    • https://classicandcamper.co.uk/wp-content/plugins/super-forms/uploads/php/files/h2brdhtdacod8lp652vlugmque/84095232299.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3b0a38f89db30ebaf255cc95dad80133/fukafuwakisifulilanu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d9550b644064ca903aae995e267d8984/80848889032.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/wufivide.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/1p7673bgdqqqfckeir4kemf51s/61259085271.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210519105823.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/fovanitojul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=manual+maquina+de+coser+singer+dual+802PDF 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_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 11304 bytes
SHA-256: 5544301ce9250d1f63ed857b87d36c4cfda651c3e719ef1b7592b2fae342fef1
font_02_sfnt_off00010498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10498 16560 bytes
SHA-256: c474546214f69c567407b71a5af9419ef4970b65fdc9ebe2ef80c20601b0fb69

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