Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5f68d765ef777f…

MALICIOUS

PDF

85.0 KB Created: 2021-08-08 16:25:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4db087b137e62e182177ac8e2a98d465 SHA-1: 379f3308bf6ad718d3a700fd7423cdc4a6018ca9 SHA-256: 6e5f68d765ef777f7612efe68d2cdfd79f08a9d9df77ae830ecc2ca7c2884b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a specific ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://infrive.ru/uplcv?utm_term=can%27t+connect+to+rainbow+six+siege+servers+xbox PDF link annotation
    • http://tingyi-bnb.com/CKEdit/upload/files/58299357397.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/61219217178.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094ea1c309b9---fiwanagoruterun.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b03eb52624b0e5bd7db550ef71404b60/folod.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/juwadexad.pdfIn PDF document text
    • http://cokhibaosang.com/media/ftp/file/59822727574.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/5665879277.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/42032398852.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/pefodafitofo.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f345cd843---49854223339.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/sb2qdt8d0uqq11f1f0mn5868gi/dowusejotepabekujo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16098c069705a5---93277389162.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/a6a3d2b2cdb4c40b6a0305ccba5b54c3/divepezofalijudusabupiga.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608550433a523---11072305551.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/vukatus.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d23d057eba---85984969511.pdfIn PDF document text
    • http://ubest.ru/images/file/17971227046.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcf3637cbb.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/nubaxut.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b3681855---68196114005.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/95889988403.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/7d500555255edb723192dfc9aa7ebd26/57398307386.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/rulev.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/33674025778.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_off0000e871.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE871 16944 bytes
SHA-256: 968d0283091615407f8d9f5a9123efd03d481288b2179212651e978b8ee4a0fa
font_01_sfnt_off000114c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 10820 bytes
SHA-256: f60ecae64f6d4de51fa42b97c752a558fea4469a5364ca62549e8f09ce06d994

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