Malicious PDF — malware analysis report

Static analysis result for SHA-256 68df94e6425829f9…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 07:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1ba0fa726899295bdb4d6b428c29157a SHA-1: 6ebfd2c9e1032da9c850cca54d45c437474ddd7e SHA-256: 68df94e6425829f92c124d9f432515f7218ebf2d8f5f6272708d40e057fbc0ed
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://activepymes.com/pub/file/rutaruvigolifujutat.pdf In PDF document text
    • http://geometrabottero.it/userfiles/files/saboribinanekuk.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/709342b8783a690fde83628754441ae9/pifiluvuzava.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bcd91e52ed6f008b75bff9157fce5750/85583649392.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/f80g3ot7js6m67u2tjfemmf35t/nezavexubimevovepav.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021082810183873499.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-7-3/20210703055455863275.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2d9872fe6---95165525168.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9b4fc7de8---wazuva.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/23353627933.pdfIn PDF document text
    • https://alyosserspneed.com/userfiles/files/51262993392.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/3920489447.pdfIn PDF document text
    • http://fgosvo.ru/files/files/majuvipamuvewefef.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/tibezovinumadogobamevumo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/vekukovutavebotaladusow.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/c6ud2agojhhkd8blg21b5qlkbh/41064455876.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/gufakepebupiganolixebifuj.pdfIn PDF document text
    • http://caramelitos.sk/files/dunodux.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c87ece8f612---14571282460.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160cc4c0bcbf81---bitolutupegegifinalifojig.pdfIn PDF document text
    • https://pecsikult.hu/files/file/mazarejevameri.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf3a9c57c---vasilimilizisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=electric+guitar+for+beginners+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_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 11016 bytes
SHA-256: 765d84d6a262ca72c9fc6e06478afed2f6b139bef6b234bf0521c6fc81b76869
font_01_sfnt_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 16972 bytes
SHA-256: 54bfd411bc893bd40fd9f60b1c77200170eaae9b74576d88e96b84990986cf52
font_02_sfnt_off000121a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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