Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b74b5e78f27bbc6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-17 07:00:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1918fcd4db515ea9fc037dbf94dbbf2c SHA-1: 8f41876c57de51593e0a4fa5e3fc9e9064cd39d5 SHA-256: 9b74b5e78f27bbc6f2ae58f6b378ac1d974f7c6ccc4bb5ec06bc1f406e904d81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allytemp.ru/uplcv?utm_term=love+font+style+copy+paste
    • https://frigosztufi.ro/ckfinder/userfiles/files/64619609258.pdf
    • https://profesa.net/userFilesfile/jesefug.pdf
    • http://alstar.uz/images/shared/file/5299015312.pdf
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/52314354481.pdf
    • http://hdg-gmuend.de/userfiles/files/78896306944.pdf
    • http://szyqjsj.com/UploadFile/file/20210915152730049.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/70121002792.pdf
    • https://acryl-bg.com/userfiles/file/81686257171.pdf
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc8a262d4---wegijedinelizos.pdf
    • https://fiberglasssupplydepot.com/userfiles/files/80905312639.pdf
    • http://salonorganica.ru/upload/files/fudofarodezid.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16131479891acc---96902560872.pdf
    • http://chupanhnoithat.vn/upload/files/73316807966.pdf
    • https://itracmediav5.com/ckfinder/userfiles/files/85885248875.pdf
    • https://fzclicks.com/demo/files/editor/file/kurewuzine.pdf
    • http://cartonwrappingmachine.com/userfiles/file/48668575874.pdf
    • https://ozsersogutma.com/upload/files/winefapadezokewividof.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161418fb95501a---49510045257.pdf
    • http://jandebruijn.com/uploadimages/files/xipavugosuwivenazovitiz.pdf
    • http://chongthamphucthang.com/images/news/files/naropezegu.pdf
    • http://dansungsala.com/uploads/files/puzogipobow.pdf
    • https://alihuata.com/userfiles/file/63240266056.pdf
    • http://c-amc.com/upload/files/64671747242.pdf
    • http://galenbio.com/images/upload/file/bewaxidigaturuvid.pdf
    • http://biplano.eu/userfiles/files/guxisesumopuraxexa.pdf
    • https://aiaciran.org/cache/fck_files/file/retuterojunazeluwozijikip.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b62d.bin
8eecbc5c5d636c84dc5eba49f644613c12c8d8abfd87c550825e3770cbd613fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xB62D 15388 bytes
font_01_sfnt_off0000dd8a.bin
4613a50bf3f99d5b43ffe68f7fc3618928edb375cc3203c605e38d1438ded263
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8A 10416 bytes
font_02_sfnt_off0000f566.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 16792 bytes