Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a64b68b146793d…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 16:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8cebc48cc4b43a13961a88406a4f34c6 SHA-1: 7b2a2750a9111071b41f8a36760df6a242fd4f53 SHA-256: c2a64b68b146793d204d2d8fe1f2e3830f60ed5277152a532ef01c24dac2fac3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://nomylo.ru/uplcv?utm_term=le+quorum+sensing+pdf PDF link annotation
    • http://transporteslaplata.com/imagenes_web/file/98228870269.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085ca57291ff---3853429222.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081661a59318---86799796868.pdfIn PDF document text
    • https://pmms-online.com/assets/file/pitekefupipa.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160782345aa16f---digorodi.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/26655566976.pdfIn PDF document text
    • http://hydrem.ru/images/file/71172109216.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/magolovasufe.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/5116e85fb0d0d2434eaecce0da7580ee/rojijusupif.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/kunedesikowolazu.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/pezamarizamotojusatu.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/62788335543.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/43250739138.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/94090360381.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/71257732602.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/dd6bd4617a042023685016770e59856a/68852405350.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16126d817a1cea---jemejoxiboxuwogakukogixe.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/44985393611.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/97516534587.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609439e4e40a4---97500102258.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/08/13/doxogibolikozawatijaja.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1c384b61d7---79274362791.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c805ccb81d---rewokonalobab.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16098b81480431---3044251751.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_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 10740 bytes
SHA-256: ffa5d720b2a76d677c184548d63eac65e6cf96f28f45054f88246c56d65fe92f
font_01_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 18740 bytes
SHA-256: 6fb065187ffdb344639f79383153fa691d352a1a968b0bdd18da689213c1362b
font_02_sfnt_off00012901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1