Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3cd7f0af81aa38f…

MALICIOUS

PDF

92.3 KB Created: 2021-08-13 17:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c0c458e49b50ceef7a3ecf6c63a8ea9e SHA-1: be94e21444cf105d1d4682ca2a9875584cc3c130 SHA-256: b3cd7f0af81aa38f0296dd0cd6ed90d5c68e44beb7180aadaef5ce82ea464208
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous embedded URLs point to compromised websites, suggesting the PDF's primary purpose is to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/f00klpbulo1kn493aqckrf241c/60155333063.pdf In PDF document text
    • http://portalcom-b2b.es/img/user///file/_0707096001628707499.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/damakufuvejun.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42a8e94275---97189847461.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/3db8256dafc03a6d9a5dd05a55a398e6/tafageda.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c871c4440---rajifajebenigazisolox.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/vezuluwavagox.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/vorujavibekuraxurezetotup.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/45213643449.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/95087583867.pdfIn PDF document text
    • https://premium-house.uz/images/file/4682848490.pdfIn PDF document text
    • https://stvorki.ru/files/file/zinazewoja.pdfIn PDF document text
    • http://airfa.it/userfiles/file/60689786957.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/mexalemal.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad462939e5---reregefolixot.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/xakunilipup.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/10651791935.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/dubinul.pdfIn PDF document text
    • http://sierrahighalumni.com/clients/878712/File/seliripumox.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/tebozanejavujunujefugimik.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/bcd7dcee77a8e3fabf3e985a7e4232df/48019710140.pdfIn PDF document text
    • http://abnicum.ru/files/file/gukod.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/10/vugoxunu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/kce096ujanl20m87sdg89bfea0/54378385249.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b51293ffa---40978469330.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/hmpda8em4g9jfveacqrtold6h3/4937023483.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9b9e2495---39921002162.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=ejercicios+resueltos+de+ley+del+seno+y+coseno+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE822 19956 bytes
SHA-256: ad76f02af00cfe2e46bf9cfb90bee3de28b373c4a872846641d2ea49e0d561a5
font_01_sfnt_off00011c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C47 16180 bytes
SHA-256: c6ddb0d724a693ccf151c518b248783f5d784219327f8ac6643882cf11d872af
font_02_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000149f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F7 10780 bytes
SHA-256: 2bde7e9377b63cbebf902a9356964f224bf27d6a1a0848d404d0eaf89c9d9844

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