Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6efad92efcdf3e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 21:08:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d29eaec833edf9da5c2913f50dddfae5 SHA-1: f1312536ad5507dfff7468f151416b0e621a4b95 SHA-256: df6efad92efcdf3e2d08ee60b1a81c28bcb3ca455c15dab44632df55be97d1cf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no explicit scripts were extracted, the nature of the URLs and the PDF format itself often implies JavaScript execution for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://philabc.ru/uplcv?utm_term=coolie+no+1+old+movie PDF link annotation
    • http://koreaticketland.com/userfile/file/kisilazo.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/dirore.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131f60066d15---gosojavigupariv.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/vesibolufazase.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/bujuneralekiz.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161368641383a1---xikokoteroge.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/gesulepitoni.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161398f1396df8---65619530149.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0794b3f9---23927518646.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8c2298c8b---94236360894.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/78748167759.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/firebokevusekuzo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/atg3r6njpojrsv1t2fftt1hir1/bifutazaduzevipuzepapuki.pdfIn PDF document text
    • http://letsfinal.com/userfiles/file/66477832163.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/japijolol.pdfIn PDF document text
    • http://wannawwannie.pl/userfiles/file/bikagujuzet.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/7669492109.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/17603991541.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/706275221.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/35030077925.pdfIn PDF document text
    • https://ewt.cz/res/file/vedosonuzuramevexewu.pdfIn PDF document text
    • http://twtime.com/uploads/files/202109090744201466.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/67139800353.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_off0000d51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51F 10032 bytes
SHA-256: 96f543f76e83234964eeea488f54fb3de4590e594ce8a2e7c515a2ecc653520b
font_01_sfnt_off0000eb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB61 18624 bytes
SHA-256: b5329a945b77a88b6835f4165c4f4f0181598e489b7937cffa0850c837d0ec95
font_02_sfnt_off00011b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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