Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d567abb786e30c…

MALICIOUS

PDF

87.0 KB Created: 2021-09-23 15:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6f6d6229fb93488c10cbeaae58ad78ed SHA-1: 2da1e9bdb00e23f45b09a68505ce646250c36fa0 SHA-256: f4d567abb786e30ce3dc6b7ff9ad29521ca4adbc5badb9076e441f581249ae98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://allytemp.ru/uplcv?utm_term=5g+network+apk PDF link annotation
    • http://klaaswester.nl/img/file/2937219399.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffb5039822---75712544072.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/wefobazi.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/nebuluzaxafiv.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/9559726667.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fdb037316---60879600022.pdfIn PDF document text
    • https://vigilanciaweb.cl/dinamicos/files/file/31913709949.pdfIn PDF document text
    • https://drproperty.in/userfiles/file/93220537151.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/77128154042.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/7aamhupcj0g7nchar6lhs54780/luzujojewinamowodetijuz.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/pajebifaki.pdfIn PDF document text
    • https://ms02bet.com/contents/files/zevovu.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/nojufafozolewipu.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210909003029.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/33610232092.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/vuzudimotin.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414c7e4dff3---34394003682.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/49840664451.pdfIn PDF document text
    • http://tce.vn/imagesflashupload/file/talotub.pdfIn PDF document text
    • https://detectagsafety.com/ckfinder/userfiles/files/sefofo.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/javakedajalonisagupu.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091109555024.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/tudini.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/71595926320.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/nebapinepuxetob.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/vevolanefozi.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/58q265qp30om3mb16a4o48licp/43092010026.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/52348250443.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_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 10336 bytes
SHA-256: b0b5272d34687dc0bbed07d14f1c811674a5520f2aea816e887297091135681a
font_01_sfnt_off000106e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E3 18040 bytes
SHA-256: 181faa79cfd741dc680a6c930374060bc5ef66e4d2a590608c7fb74c1e57a2d5
font_02_sfnt_off0001362f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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