Malicious PDF — malware analysis report

Static analysis result for SHA-256 91db2943379b1d26…

MALICIOUS

PDF

72.7 KB Created: 2021-09-07 00:38:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 795847df3cd9d47cf6d4956cbb02eb95 SHA-1: f2cf4f1dbcbfc425dd93b6922fd974630888eab4 SHA-256: 91db2943379b1d26b233eea045d897dd8d067ecf6c3ba9c246c8c9f925ad9978
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820a2f2c7fa---jowebu.pdf In PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c347fb1fdc4---83407899523.pdfIn PDF document text
    • https://mtmhomeschool4art.com/mycms/uploadedimages/editorUploadedImages/file/98020930203.pdfIn PDF document text
    • https://sesconbs.org.br/ckfinder/userfiles/files/95079590304.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/48677c38e981feef726ea2394731b460/7209086837.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/tiwifofasanab.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/95097004163.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/1222581690612b8702b5aa7.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/pujaki.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160baed18a4f29---tokirujeligi.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/41c51aa468130860005e80a97a2e0c89/vepugawaxolupufos.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1611fb675951b0---vitekagawekumedawezo.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/723248bd74b860e34163c38303ada02e/biruwub.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/dawogojuxedumajukurirenaf.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fiwafa.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/5268450735.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/72821044061.pdfIn PDF document text
    • http://dgkno.cn/upload/tukolofiramijokemoku.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lcigoh46om3hmp7p6qfauu0ien/rixudu.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/gubufunikunelirif.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a8275b03cda---kibimakamufu.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/bf582ce287f7b1977a8ccb583a46641b/lukebevuwizawa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=key+ideas+in+linguistics+and+the+philosophy+of+language+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_off0000b906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB906 11004 bytes
SHA-256: 2b57b145f817c6460f6c20bc0d3df7ceba06b231dabce089c208eb83bcbf70a1
font_01_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16268 bytes
SHA-256: 1bf48f5cc4a37a10ed96b7615662049c5f2e66115d8a7cea77cc85d4441e8ae7
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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