Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ba547283a88237…

MALICIOUS

PDF

82.9 KB Created: 2021-09-11 22:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee4205a252e88e6b747eb151a333cdbb SHA-1: 92db1aea557f40068ab7e2f679025ff35418f018 SHA-256: c0ba547283a88237d2089d97b15a019e3013e4f763ebcfb3b76baf5c45247726
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous links, several of which point to potentially compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection strongly indicate an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://brenna-ski.pl/userfiles/file/80715005078.pdf In PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8b2a7b5f066f31ec427f44e6e3707ee9/juxigefukod.pdfIn PDF document text
    • http://skolky.info/foto/images/file/mupomikopijebuwumobo.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/bafivokojavatubazuv.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/89250874144.pdfIn PDF document text
    • http://smalternatywa.pl/media/upload/files/3bd14219a8fc67b4e44e6a502c26a00d.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/rorixebuvimurugusixixag.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/10876369461.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/tobajaxufikig.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/resifepobizoruxodolel.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a51e54f28---kigotozudofutejam.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/67059132231.pdfIn PDF document text
    • http://oodow.cn/upload/file/210911010937645683s2z4b7w081ci.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/godavumonova.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/42rr3dq1194fnsrdlugevcf7vg/20797722714.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161356f503cdb6---62942918556.pdfIn PDF document text
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/pudujolorobelupubabezugo.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/tejafatilujolawabiwutorem.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/gejedowesoz.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/gokuzewajafiwezapowikiz.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/wopopivimezovuku.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/69981283702.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=captain+america+the+winter+soldier+apkPDF 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_off0000dd96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD96 18128 bytes
SHA-256: 5631162e127c488a5c56d5b077e16823d721fa6e1ed6906dac8c3c712292d5d4
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10988 bytes
SHA-256: c5ed90eb063c1637cbbb41570ea7e8ce0bba1757d8370bd5170e273cb7a45350
font_02_sfnt_off00012648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12648 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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