Malicious PDF — malware analysis report

Static analysis result for SHA-256 862eb14fc5e49c14…

MALICIOUS

PDF

171.8 KB Created: 2021-06-25 13:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d02ec20b5244cca59c2ad550f7705666 SHA-1: 01931a4759227d99d666c9f43ba96e1ca8c8c6fa SHA-256: 862eb14fc5e49c1467db58d28ff55ab0a2da0542345ccd63d17666e0738350f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to numerous other PDF files hosted on various domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document intended to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irrisyst.eu/files/file/vexowufotagotigibipedoj.pdf
    • https://swagath.co/new/ckfinder/userfiles/files/garuvuwesanut.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/91c0ffb1076323f33e27844d1393901e/7537609213.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/841b06c0e5a6ac3d39dbf2d343252c6f/527695015.pdf
    • http://perlawarmii.pl/userfiles/file/govizekesij.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a338b8a69a7---vuzudam.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a54f456c03c---17199583196.pdf
    • https://nbtele.com/en/cache/fck_files/file/48698761432.pdf
    • https://dgaspcsm.ro/ckfinder/userfiles/files/74773845393.pdf
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160bffef2d5821---29100446781.pdf
    • http://dhs1959reunion.com/clients/871764/File/desopokinozagivaj.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac135519ac4---devovurekiger.pdf
    • http://scheiden-maassluis.nl/uploads//file/pizekufitigekopep.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/864babc12097f595fc0c47b2b87206f5/xalavawugilujebadazi.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a42b71ae94---sewipisekabuwegubasol.pdf
    • http://eraucheta.ru/uploads/file/wexuxinapiwigam.pdf
    • https://canevastoilestjean.com/upload/editor/file/saxukogifokekukawo.pdf
    • http://kasargod.net/uploads/file/51732231572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=about+karl+marx
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00024400.bin
167a43d0c50dffb86c54656d09982bf71ccb98953615d634163aaf253cd4a4d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x24400 17620 bytes
font_01_sfnt_off000271d4.bin
6b58db7af2cc130367b069124955b5f8e931b5d5634af6a8540fbb32630a927e
pdf-font-stream PDF embedded font (sfnt) at offset 0x271D4 10188 bytes
font_02_sfnt_off000288be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x288BE 16792 bytes