Malicious PDF — malware analysis report

Static analysis result for SHA-256 d962516a8e64df2c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-08 20:24:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4ed4ed3d312b9f12c4c15dfcde553814 SHA-1: d0fd99f338254a4282e699b26ac8fb2ad74200a3 SHA-256: d962516a8e64df2cde1cc2fb2514c68692a8ac09f47280045916e4eed9e253ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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 http://toyotacri.com/userfiles/files/86901570931.pdf In PDF document text
    • http://m-s-g.ru/userfiles/files/68531490174.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109010921191122.pdfIn PDF document text
    • https://cnc-ar.ro/files/file/kutunobaxotelurojukigog.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/67114065306.pdfIn PDF document text
    • http://cpghollywood.com/userfiles/files/xamaxusifaxususodexitiwit.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/zolofuna.pdfIn PDF document text
    • https://vhcvietnam.vn/ckeditor/images/files/monojojefubajov.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/29968123610.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/94414690519.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/veragol.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/pubuzikugogize.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210907145022_582761472.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/kexulofebowopezerewikox.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/kafezemezekokaneketuziwe.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/73398693017.pdfIn PDF document text
    • https://hssanesteban.cl/files/xubabaxewazexa.pdfIn PDF document text
    • http://spakimthi.com/upload/files/52337650189.pdfIn PDF document text
    • https://thepainter.asia/upload/files/timinosozarigotopafaf.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/widezokokag.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161385e37799a7---nakuvogikunowonuse.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/97665999963.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/97039532289.pdfIn PDF document text
    • http://splogservice.ru/content/file/31572292471.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/xekametigopebokexupuvatib.pdfIn PDF document text
    • https://rjpexport.com/files/71974684276.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/670d3cb6899a9e9e0737bfcb372ef3d4/jajujijawumumixev.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/pikerexugodakiwevevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=special+relativity+and+classical+field+theory+%28theoretical+minimum+3%29+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_off0000cacf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACF 20956 bytes
SHA-256: 5fc20a8bd229e98da02d255aa4705d8094ac6954e8fc8684fa3f8f43ef46119b
font_01_sfnt_off0001014f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014F 11568 bytes
SHA-256: def01f996292c6731708780dc9232e59f1152bcbec94b8bddfd7f03c51bb1ca6
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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