Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d08dbaac3f21a5e…

MALICIOUS

PDF

98.8 KB Created: 2021-09-03 22:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d0627899d077d7f31c2070d244d22b65 SHA-1: 0b37456ec3725b17cab102713d09dfc6fe016eae SHA-256: 3d08dbaac3f21a5e86c5595406963909888bf6dd764fa486068fcac760c01ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The presence of these link farms suggests an attempt to lure users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/62da4f9d2de69520ef1543b1199c70b4/57347454220.pdf In PDF document text
    • http://dnt-mayak.ru/content/File/xiverewijupuwogokapubun.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/grk9rnpip0r6kclqgn3h245fgu/68394803745.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/rirobudeviwokusovirodoze.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/38763705099.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/a6lfim0s28vt1qi562mhi28ao9/xenogubemowolanuda.pdfIn PDF document text
    • https://castel.ro/userfiles/file/60777946371.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/tuvukov.pdfIn PDF document text
    • http://mawaevents.com/uploads/file/wetumififomukogej.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/b0368f2b1512043a9b977b5784091d59/pimokuxanituzuvamebuwo.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/60019478101.pdfIn PDF document text
    • http://www.culturehousesun.org/photos/file/97694300047.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dea4a86a---rizujopivoxazopabijimoju.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdbb479465---pigipirilifewefu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/t6tgm2oc4opl1ehum5bicb0cm4/33148770867.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/xipiriwagup.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210828234813.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210629052645101.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f513217602---vidijagini.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/4110cd8fc8ef8ebed9e95fd600763eb6/97965077868.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7da11509e---rozev.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d3be501d6---xulavoxe.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625043934.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e37dd7fe74---50116189510.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///68221014223.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=fao+fortress+europe+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FB 20136 bytes
SHA-256: e54a9449da18fb94deecf38e9ec197e6f4d34f2fe65d93905bffca3dfbbe9131
font_01_sfnt_off00014e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E55 10324 bytes
SHA-256: 8f906a537112ec279f9a811bca2d6c981b7ebec496d9c84ae0dd84936f62bf70
font_02_sfnt_off000165c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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