Malicious PDF — malware analysis report

Static analysis result for SHA-256 8464cafeabb6d64a…

MALICIOUS

PDF

73.9 KB Created: 2021-09-21 00:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e43c96335c3e2aa1b5d1193444ad6bb6 SHA-1: b845ba2205c2e14c1936daeec7ca693aea197339 SHA-256: 8464cafeabb6d64adf29a3bb8986c90776737af3e99ba201460d2539e0d4dae3
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 as malicious. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://krisoc.ru/uplcv?utm_term=gms+installer+2021 PDF link annotation
    • http://egyptlance.com/userfiles/file/zaromibaxojeberiz.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/35153655385.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/xukofadoredirizuwokurep.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf4b03db8b---21065352544.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/pakonojakeror.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/73918155074.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/ramobemuja.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93b8dfe16---45030515562.pdfIn PDF document text
    • http://daejonggyoyc.com/userfiles/file/20210901173243.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/korigegovatowo.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/lisiju.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/15d622b8207c8432e6a9e11a0b1e0c9a/55051965481.pdfIn PDF document text
    • http://tischtennis-kiel.de/images/file/41610541467.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/80347240497.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/72750f1964cf8b9b9056d58432e133ca/10360042042.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/zijubi.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/xatepeluxopud.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/6182fb2eb2f2221789c230b7c1b67c0f/15118011256.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/32982950577.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/58403886073.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210908214517.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/641525854.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/9c13e2a82ac8b4c676745eb371ccf124/55312686765.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/jagoxunoxanegiwo.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_off0000be6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE6D 10480 bytes
SHA-256: 9f9b47e33a5ce1b0892450c68541e545911b7c9402b1c9c16a63a160aac0f0f7
font_01_sfnt_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 16796 bytes
SHA-256: f99f81f23e04f95937b637013d13a7eb59e3e81ba1e5755cf0ccce946c2d15f3
font_02_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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