Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d611ca9df9964bb…

MALICIOUS

PDF

98.2 KB Created: 2021-06-30 03:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 47ee209c248061dceae382efd9e6ded9 SHA-1: 35e0f7311721a599c84753d441ce138591267b14 SHA-256: 4d611ca9df9964bb9ae55b8346d39f43b9a743131e0580c37f2b2150bb6556c0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and a link farm structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://xn--2-140-swe8h.xn--p1ai/files/vadorabuluxa.pdf In PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/bd7955c580dade86f3a6af7bb5aab02e/solomisibaran.pdfIn PDF document text
    • http://dailygiasi.com/uploads/userfiles/file/mesizexaj.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/crm116ts5tg6nbgmsje83l77m2/2144149186.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/ce0aa15be2d59d0468302b6efb55d52c/gukulutor.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gexefozipade.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67dad432e---didesuvulanekakurofawised.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/aefa024d211c867d7cfe8b5893be3c59/tiwuzosalitif.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ad83354fe7675914d66043820ad09aef/sofegusidumefelopen.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/2edf91c5461a3d8cc55aef4a853bf4fe/75332178537.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba46570ec1---31596477566.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbff401894---neporexibakaveritotorepu.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0874a04f5b---27400069687.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/xafutomipiwuliduzumu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/f919095ee9135ff968eb61bd894d9f5d/62973976903.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/hpnncdvoqvtld9u9eg2s61m0t5/52304302002.pdfIn PDF document text
    • http://camonetinternational.com/files/file/66766249471.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/h592dkbbjr14qivvrpno86l0g6/41555019145.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/42132925880.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/a32470fe5d68cc792132dc3d9a923e7a/19135577331.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/fdeb27ce8529030695c8d6c4abf621e9/pidemimojuvunid.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/xumunaxilapomufi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/65700371840.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105170045.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/0vjls5rsmsc8uhdkg9d2p3m8tm/gabipifojatasis.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8103418e7b49741247d060145dba4b3c/30983397418.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a508b9202d---66403516306.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=phil+mickelson+steph+curryPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 18300 bytes
SHA-256: a511a8b6dd7d86c1fbffd8767a27e3f26a9dab7c207a5cf89def6024943f91ca
font_01_sfnt_off00013096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13096 10784 bytes
SHA-256: 67ffc399fb5db0d0fd0ce5d4c0d6fbdba18266e1927d0e95a77fd455b8ced83b
font_02_sfnt_off00014944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14944 17000 bytes
SHA-256: 3bf5d0d78ae06edd8a6ad4dadc2a8aa67521936842beef582215e4f5e8c79fe2
font_03_sfnt_off0001615c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1615C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1