Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8af64a90f296859…

MALICIOUS

PDF

72.0 KB Created: 2021-06-26 06:17:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: d9d89b20c249baf1f1c0e62cad66ab0b SHA-1: f43c98bf8798d6a89a214ab9b947d8e9c4bc5723 SHA-256: b8af64a90f2968599bbccf091b4d4db2d29cd9a4e5b3ae1e15b0f34d0a3e49ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=what+is+the+square+root+of+64+cubed PDF link annotation
    • https://contactfm.be/userfiles/files/61269677957.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/c63c72caf78d6de1b06d74e440cc83a9/suradisaraxivijigenop.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/52928939517.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/b4ef2b68e6f8991a8676aefb445589e5/4141806602.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a87b24e6794---patewurelalaragovuven.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160950c3d98f6b---godilewoburakikikimule.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/78abcb3fca1d1625cec7c761607bf2d9/25936525498.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/ziwunawapujomiwasimof.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/fabaxewuk.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077e34c719d8---lusugirufalurilifugow.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/tuviwinabidelamufutobebun.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/74bf8ae46e345a15288711ac871739ed/18386512803.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/42341226533.pdfIn PDF document text
    • http://smithandfriendsfamilyreunion.com/clients/d/d0/d05d9bb0b75700e7199fc64e52c62161/File/nawujeropovifofadebevof.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9470b4f1e36c80dd1bdbeb6d119daafe/31112823843.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/78850667411.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/0339deb311d53eeb95aae52523689e07/10949700500.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/d031f745b4ae3e90743fa74cc24feaf1/56061476606.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa2a9ac1c8---17903595044.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/0p0m3padcbdf0hcn5522dvfiol/popaladosaxa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a249c0472a0---dovumaxusogivupopabulitu.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/abadh5vdkciseinqlvijq72nod/4540845148.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_off0000b7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC8 16740 bytes
SHA-256: 4c304da7340df38ab30521dceb313dcd40f420b9d39fce50cc81d9f1b284b41e
font_02_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 11048 bytes
SHA-256: f9762c2d05d8788f6c7b49122462df1c66053d3cb00d39cdba6162b22fd06beb

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