Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0386e7efb2f636a…

MALICIOUS

PDF

71.2 KB Created: 2021-10-01 21:44:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: df286146e53f9e0bb639b53b53353c7f SHA-1: 9002a1d7b0165007436ff537fc4b4efda021fd68 SHA-256: a0386e7efb2f636a2c571836800cc90f526ad4584662fe1b1a8e033b89489956
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate it functions as a link farm, directing users to various external websites, some hosted on compromised CMS uploads. The presence of multiple unknown-reputation URLs suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=watch+boruto+episode+65 PDF link annotation
    • http://conblocmanado.com/pics/file/13306369243.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/14100120340.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/11030286254.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/7b11426bb46ccb008101af91297c31cb/71975271298.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/44010983688.pdfIn PDF document text
    • https://domilot.com/uploader/files/mixaruzinotomubizilufobur.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/gumaguvenogozawefaf.pdfIn PDF document text
    • http://haohanlegend.com/Uploadfiles/files/9328251422.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/zojomaz.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/wimatosofaxop.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/pipapepozivij.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/96561970159.pdfIn PDF document text
    • http://erfanekeshmiri.ir/userfiles/file/61934986587.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109301734342444.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/mefepibetanepexilobudobuf.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/38785689311.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/62847294922.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161308d4538afa---taxugudowovotedozovud.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/42670901721.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/todol.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/lexavevuf.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/rimamabajobapori.pdfIn PDF document text
    • http://wirtrauenuns.ch/images/file/rufelowivere.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb44b8d653---faxifixidafikibe.pdfIn PDF document text
    • https://ebooksweb.net/files/file/72623723674.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_off0000b2a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A7 16212 bytes
SHA-256: 452733b1f6c5e13c9275e380a86280b902749929c27b9bd72d6ce02ea8178b62
font_01_sfnt_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 10996 bytes
SHA-256: 58d4f716dba82a0146fd1664a910b25cc05571d020110cf6c3aebe9d763d5c33

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