Malicious PDF — malware analysis report

Static analysis result for SHA-256 eece5fdb2291d341…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 16:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 18e490eee5eca455166f8a1b4275c9a4 SHA-1: 790db4bae35022f323aba50bb2a6e3a6afbf095e SHA-256: eece5fdb2291d34121cb5474f123163facf9ca9fc8d218badee0ff968d202a03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute further malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://www.radio-kum.si/data/files/74007192635.pdf In PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/f532717a654933680626e9baf5da7608/wakiribiwesoluxuvifubuton.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/94627905744.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/47383584428.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/31927354343.pdfIn PDF document text
    • https://stopserv.ru/files/file/43466209004.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/7970ve9q6shfd0dsfhr7iear5p/56030688164.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/togunalixawalom.pdfIn PDF document text
    • https://andhimazhai.com/images/files/ginujebamanekinixujin.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/59427616831.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/63575107469.pdfIn PDF document text
    • https://spiuruguay.com/ckfinder/userfiles/files/80463297864.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/583358bc3a6ea222feeaa2606089be96/6787445760.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609608dd50f15---golitusebigedulija.pdfIn PDF document text
    • http://metalltechnik-kutschi.at/tozinegugosutelifitem.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/86639124679.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/7448378213.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/86286624884.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/4249071217.pdfIn PDF document text
    • http://cocoal.com/uploads/file/vasev.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/potuxalaxelitovasugeluba.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081afbee98b4---negum.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160786646dd016---bedorur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=high+school+supplies+list+for+9th+grade+pdfPDF 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_off0000d5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DF 17472 bytes
SHA-256: 20516284146ee65f3c593b1051eb1001f4bdc51fd97bf40ac84de7afa0e2e0a6
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A61 11052 bytes
SHA-256: 1cf429fe858b0d7020f63bc718268697837eeb8eac97d7263af10e165c9eb7d9