Malicious PDF — malware analysis report

Static analysis result for SHA-256 3051908197e69afd…

MALICIOUS

PDF

81.1 KB Created: 2021-09-08 01:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61ea04c6bce009ca25ed628185bcb4c3 SHA-1: 70b0981d0c012c7c0512e07c9c909a9beaa304ef SHA-256: 3051908197e69afd990761f9e68a600e7bc5c4e6a417ddc4438e1f58b26955bb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1cf0346e---banolid.pdf In PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/fajewijoso.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/guxubadubowemavojewet.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/mekabobivijabogiviwezu.pdfIn PDF document text
    • https://jetaime-shop.com/files/darilamapalajasow.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/vuxiwalejoju.pdfIn PDF document text
    • http://dakmoto.cz/obrazky/file/kojaterifanar.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/a5l6lgo6l72ogho7m15ob4f810/44966981556.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/50955290812.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ef2683cddbd8af5061f3d10d41172a59/joxonifoxozazedudob.pdfIn PDF document text
    • http://kotolantopeni.cz/file/xufus.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083864cc810b---35320873154.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/fedimitowiratu.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xalemolam.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/0dd2345d55430ad044b0d4b984e19b6d/panulet.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/63440091293.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/93117155244.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7e0e1367539c3d54a3196ea5d48cb50a/jeloboxinapepudobup.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/winodaxim.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/0373bef78fed48e0fdc36f25df9015e0/27023061900.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/g0vg72br1k4aoskapti465e7vc/zebisonerutavikopijerixi.pdfIn PDF document text
    • http://flamefitnessstudio.com/cewit/images/file/98423899017.pdfIn PDF document text
    • http://thangmayedex.com/webroot/img/files/41728921038.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/xupuwelifa.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/2066540866.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=four+seasons+winter+piano+sheet+music+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_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 11000 bytes
SHA-256: e1391746111240a0a56723cbb2f2dd95b03a9655c17155ecec0488d61c3de260
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 17556 bytes
SHA-256: 3c35b007eafca1781c112d170e78aa113843aef941661c29c0db01a545e08d58
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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