Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c141af7190981f4…

MALICIOUS

PDF

214.8 KB Created: 2021-09-11 07:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e32ac7a605ae621c6c90ae10f0d73d1 SHA-1: eb244f334c00613b978b1916711d1bc1ac8da1d5 SHA-256: 4c141af7190981f4a1da7223c0cf8de1e7f979f65dbd60c25e3a9257e451322f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161306ff89aa26---10898140918.pdf In PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/60198116297.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/93322190407.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210905215413.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132658803828---99212199385.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021911212482025.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135dc9762a5a---16528032289.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/88943245656.pdfIn PDF document text
    • http://espwireless.net/uploads/file/74116678721.pdfIn PDF document text
    • http://chikatere.com/Upload/files/2317761368.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/21358180471.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///20219215589527.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/gozof.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/17779221695.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/46629212393.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/fogunajowakifuvazolujogij.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/37591356391.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/3021288816.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/66118148473.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc7874ea17---56977584358.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/19128499363.pdfIn PDF document text
    • https://buyafranchise.org/files/files/vosemagemezunipexo.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/jajoxanolagufimuwurenewum.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/38399637742.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/73130958447.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/nebovumorevurinuveloloni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=5+letter+word+starting+with+gaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE32 10652 bytes
SHA-256: 05be05ccecfb70be1bb677b0a0c32d831b33407e19d128098eb395830920cc70
font_01_sfnt_off0002f654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F654 24160 bytes
SHA-256: 8a631a2e86668a811508f75bf042475a39609557158a6188a19f56bb503e9e81
font_02_sfnt_off00033410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33410 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1