Malicious PDF — malware analysis report

Static analysis result for SHA-256 cda11abf01a31e4f…

MALICIOUS

PDF

95.9 KB Created: 2021-09-04 09:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d69ee6eb68d35779c6edf5e6e2025d87 SHA-1: dbd7b3f6b5a735296df2a720d6b8144e36b8c1e6 SHA-256: cda11abf01a31e4f1a58cda49e24ac96d69b414b5da6851166d8649e7da96b97
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to host or redirect to malicious content. The presence of these links suggests an attempt to lure users to phishing sites or download further malware, aligning with the 'Pdf.Phishing.Trojan' detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://aaykpn.com/uploads/editor/files/7108861296.pdf In PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/36540511441.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/66314730500.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/90367804910.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210804_86AFE38329E64661.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098527aa70b0---14088676748.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/55933779564.pdfIn PDF document text
    • https://istanajp2.com/contents//files/kejemokesixisuvufemi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3d546498---xowokirisi.pdfIn PDF document text
    • http://goref.ru/files/file/kirevuxifoxesusuvof.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ecbac5a43eb---81585355160.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16095f9013d896---gutewunew.pdfIn PDF document text
    • http://forumcutuca.com/ckfinder/userfiles/files/88728317124.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/22069306898.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/rokojisinopumuzogazedowu.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5ba75c10---jesuzego.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/8ka919h5lfe4dkmsesm5fmj670/tufawinekadupobumun.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1deb4bf6b2---45287472591.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/nubujupolajodixitof.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1943d2d6---sukasubekikafoku.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/zimabunibemesa.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/29142486707.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/36982363766.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a49002b9---6340903890.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/zariteferovijubox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=definition+of+effective+teacher+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_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012d45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D45 10572 bytes
SHA-256: c978feaa8ef92d6af52fe278a5b2a75f3716bf120100160d9a2cd042906305cd
font_02_sfnt_off00014554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14554 17136 bytes
SHA-256: d2f01f7d89cd021e5caa2a4c0a2f2557dc9ec3b22e598a9d4c54cd3523d65c80