Malicious PDF — malware analysis report

Static analysis result for SHA-256 a46f7f34516f8311…

MALICIOUS

PDF

75.8 KB Created: 2021-09-22 22:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f9667399bb0cf224c47e7df2dfb3210f SHA-1: c98bf8435a01d5e6318fa7761f88d4b81ae6fcab SHA-256: a46f7f34516f831163dfe7e1f06fd5042992ce6b86e7c88401b85d974b1491a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and link farms, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://pixomot.ru/uplcv?utm_term=maize+flower+structure PDF link annotation
    • https://ijtm.in/userfiles/file/45627387332.pdfIn PDF document text
    • http://viethanit.vn/hinhanh/file/sagimolopopawan.pdfIn PDF document text
    • http://szm.hu/userfiles/file/49265333699.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/63418265410.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613fff9fa540a---79577127971.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/julewuvatogoturifenira.pdfIn PDF document text
    • http://attlas.center/userfiles/file/47092503593.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ee5080faf747349143cb0b1ab4c07b02/dutuvowumoredeze.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/e3fq9fhcqo4j75karrj5v79eea/45520156638.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1631896567.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131497e93985---66837220105.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/disoxadu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/74490386140.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/rutuvijiz.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/bigetodixuzobapowosusij.pdfIn PDF document text
    • https://matagujrischool.com/admin/imagetemp1/file/49570093884.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/gotikaku.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba882f2c86---78375909842.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/filelivekevinibuj.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/52304162726.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/vefawozebexelo.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/48143648848.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/39467880324.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/52121370315.pdfIn PDF document text
    • https://zaragozadenoche.es/upload/files/zomuxed.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/fozetekom.pdfIn PDF document text
    • http://benardoutlite.com/admin/fckeditor/fckdata/file/panagudenozobire.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_off0000c39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC39F 17564 bytes
SHA-256: 4418a3e62e991a9aa44ed119577578d07f3e449f9258f6211e003648d3f4f484
font_01_sfnt_off0000f137.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001094e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10464 bytes
SHA-256: d764ac8746c2b50345859e11c69ed8e2ed66e748ca56667ebc9c1fff1f88a915

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