Malicious PDF — malware analysis report

Static analysis result for SHA-256 da6c3aa882e66454…

MALICIOUS

PDF

69.3 KB Created: 2021-09-03 11:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2a474b7e5a97b5e4cbf707be864930e4 SHA-1: df60026db35dab933bc288deab0152bcc003d420 SHA-256: da6c3aa882e66454fc3c914aef556f486252bfaf83f411475ed1c1fc92041ff2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://sinhadventure.com/uploads/file/21225954906.pdf In PDF document text
    • http://doubler-son-capital.com/photos/files/63229895750.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/mopiwiribagopa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612055a6401bb---86586842422.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a9180868f633234fdc02b61a56020b4/felupowifitasujidexakek.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1iu5m7bt4mojtb9gmd8g60dso4/35236573024.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/lijemusimamuvone.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/42941466364.pdfIn PDF document text
    • http://renovator.cz/files/file/nosujusosogunixudi.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acc0a8c5442---banoketekomukub.pdfIn PDF document text
    • https://airshow-bg.com/file/venoxewe.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/wijewumosenizok.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/19707276505.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/powedalanedavutefin.pdfIn PDF document text
    • http://heizler.hu/files/file/votuzunikujesazeju.pdfIn PDF document text
    • https://digireg.es/upload/61379063319.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/digogudafelowifesenowujo.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/2840224022.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611addadb8308---17443949371.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/gerixisodoverejibefupe.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/67773524611.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/pejikupeponerakuzuwufes.pdfIn PDF document text
    • https://morabia.fi/images/file/kuxobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=culture+definition+sociology+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_off0000b2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF7 10880 bytes
SHA-256: dc730a7d9baf1d32879062f88c2217ff76ce0e2f86651d1c0f59186fe141c0fd
font_02_sfnt_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 14472 bytes
SHA-256: b2f9ecdac9000b1bb50302284b75799a7572f3ff9bc2497661f090b160a29ec0

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