Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f2f3df9cf6df689…

MALICIOUS

PDF

89.9 KB Created: 2021-08-14 10:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: b8b6c232e3c4f98afccdd79c587a1c27 SHA-1: ac517c6f8ccc312ba5b710e0a7db470adb1cb3bf SHA-256: 1f2f3df9cf6df6897558fe8d8ca9058ad550462cc16caf5e5643794e7e45d41a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://urgentcarepb.net/userfiles/file/kemul.pdf In PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835ce1dbb84---jugomozefabobel.pdfIn PDF document text
    • https://aneri12.eu/res/file/90569975606.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/58839372677.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/71873909260.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af2487c68fe---fisosafakaxexedotanome.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/rexepalotinufab.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6b949d9d8---vaxametifol.pdfIn PDF document text
    • http://fobas.cz/userfiles/file/nuzulijabujubamurafen.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f943a28de11f438fee15da813593699d/lunavivapapomuvirulifom.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wifoxagebinigenagok.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/pesomig.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a8a99aa40---wamolemaro.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/muwofiwudikagaxiz.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/limabiwipozebux.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xikimuzoxova.pdfIn PDF document text
    • https://lesura.net/userfiles/file/zotokojumivofusadobexob.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/jinavu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/5115c57e10cda8e085271e344aaf77bd/gofasizivowomupodagijaj.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/e53e0e51d66ccf468514791287bce7b8/84871193214.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fbfd3cd54---41323891141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+can+i+get+a+copy+of+my+car+registration+online+texasPDF link annotation
    • https://mediaget.com/userfiles/files/wekigotegawem.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_off0000fa71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA71 11116 bytes
SHA-256: 4a3f0ae646b9e642e031360724b52088391b74605382b556eaacfcce7a953709
font_01_sfnt_off00011470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11470 16920 bytes
SHA-256: eae37f5f4e0118fe088b12a532e92a3379c156aa5751088566f379b7a3e57e4a
font_02_sfnt_off0001409a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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