Malicious PDF — malware analysis report

Static analysis result for SHA-256 5892dbaf07909052…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 03:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: cd4762f8c5a2b8fb311b46e43572cb0c SHA-1: b5be00491596ccdd55b58862b9623787ec108153 SHA-256: 5892dbaf07909052e3e44c589eb0d653dd3cc02df2716cd969db7897bf9a83fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the heuristics and the presence of many URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=word+for+excited PDF link annotation
    • https://amblamy.ee/upload/file/49296305427.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/91190808666.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/38fd32d191df3e0e8b748a1f2c961d7e/dunivirasasidelikekaza.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/pigizovonobizenexevo.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/98a8e9166b8d3cf4e40574aea7c3fc2b/35077710940.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd0cd1ce6---xobufusunukororagebafafig.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/untc1ed3chpm2m5od5vpqsigj0/32606607042.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072badb9ca30---24961967145.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/79517772100.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/dd335a47e0964bfca4b706f99a70b4a5/fitanav.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608396838d69a---38784098677.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a867c68a38e---gedefa.pdfIn PDF document text
    • http://msinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/10087647850.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607823d34fd07---89583125563.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/454e27198b0128fc0c198cdac40a78c6/bavoz.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c850a3c9d---49276907802.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee5346fd65---jubiruzupuri.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/robitawuveseg.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094cb76c2e16---vobikomeliriribuwe.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/ec86b792fb75b9045fee2f8fce2d427c/57055395579.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/27204497179.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/figebubiwuwilapenuve.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/keu2pgijs66kc3hoqtpesv3br3/87317641230.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/ae395e80ffda2bc5dc7aec9adffd97c4/45242281284.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_off0000ebad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 10084 bytes
SHA-256: 4bf3b3c93562e4e0116d09d1178e60ea177850c08177a1fa6e40851603d711ca
font_02_sfnt_off00011a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5A 17904 bytes
SHA-256: 10f35bff2c2a53b2cd64bc3047171f04b30f4530713e191f6f97b5f928ae92b4

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