Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd67d7a752b0ec21…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 00:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 04a7538f8edd1aa4ec1259d1a1b073b1 SHA-1: 67384ed47173dc39f964e1d025a1bce64ca48f93 SHA-256: bd67d7a752b0ec21840559c0d10477be08e4d62e2f09280f5665b2401c44dcfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm distribution method. The presence of a download button lure further supports the malicious intent of tricking users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=roblox+studio+apk+for+android PDF link annotation
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/5743062666.pdfIn PDF document text
    • http://huefpdf.org/upload/file/roxoferafapuxefofop.pdfIn PDF document text
    • http://tid.vn/upload/files/41004758407.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/pejaf.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/jekonaxufexe.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/gozoviwenilukijuzefutizod.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/66387820467.pdfIn PDF document text
    • http://plechotice.sk/tmp/file/vorurazejutovebi.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a5ac5fafe---karazobotewuwevipawom.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/43658689583.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/8086865851.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a4ff271cd---46889362443.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/63cdf29ebfbcb7ebfd2db4087428e404/dafuderagixutorome.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613423d2c13d4---raxixigevodexaguxavowiz.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/87978357047.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/29255566102.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab963134e---novirogafegofod.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/zerajat.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/71003645116.pdfIn PDF document text
    • http://swiftnb.com/ckfinder/userfiles/files/91383637563.pdfIn PDF document text
    • http://besteva.com/upload/files/741331770.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/17580959273.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/21072784055.pdfIn PDF document text
    • https://retta-bg.com/userfiles/90212533270.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_off0000e120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF937 10840 bytes
SHA-256: b718fbb69afa5c317f4e7f25d451a95fcfb3f823c1eafd0d1e659a1a4defb112
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 18152 bytes
SHA-256: 7857a5d9cbf88dd529996ef8d9eeac60aca3c1d9ca17c05a65167f1e95d157c3

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