Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3145b691a6094dc…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 10:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dac63bb0eab9c1a85f82ee2f2a530845 SHA-1: f8c108c2d9d760a3b792e3d223c49a6b18b67ca4 SHA-256: a3145b691a6094dc7a31e88618bc554f38e7e0d669a61656d7ec313a546b7374
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://inwebjor.ru/uplcv?utm_term=the+shining+pdf+free PDF link annotation
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e9b7a1ecc---moziwizexidobinuzidavoj.pdfIn PDF document text
    • http://seoaudytor.pl/userfiles/file/73479964995.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/84325404019.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613253c3ae579---44846659814.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/53242216858.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/55445491513.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/89090930475.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/sivilefog.pdfIn PDF document text
    • http://elitvorota.ru/f/file/29201288213.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/9407555958.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/petekafifodipusur.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/75432705853.pdfIn PDF document text
    • https://takitech.hu/userfiles/file/44558593446.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tubulavotono.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/3584786232.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210916111219.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/24898131242.pdfIn PDF document text
    • https://funbugs.ie/files/file/xasujabutafugojunemibadeg.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161394d902f0b6---mebolobokegapejisidu.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/rokuzekugonafirorizamaz.pdfIn PDF document text
    • http://tivati.com/uploads/userfiles/file/konapemapera.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137d0b7800a4---jaxajativunemezujozax.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/77088280791.pdfIn PDF document text
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/vemiramafozozi.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_off0000bc4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4A 10312 bytes
SHA-256: 395539411d82da1dc7cbaad11fa4fa15ffb8a76475cb02e0ca84eebf666908ba
font_01_sfnt_off0000d330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD330 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB42 16988 bytes
SHA-256: 5e419817e034530cbe15fd9373a790a6b3b75cc517406b82c19fcca3e67c8bc0

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