Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f50725f68591dc…

MALICIOUS

PDF

73.3 KB Created: 2021-09-27 06:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c8017d154b3acbddeeb974784377a89 SHA-1: 2d3aade24c12fa32fe50a71bbbbdfdb1e516f8cd SHA-256: 67f50725f68591dc5a212aa4ded59c9ae63d263b6bf8132ec20636adf264b667
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. While no scripts were directly extracted, the nature of the URLs and the PDF structure strongly suggest it's a lure document, likely intended to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://cuanhuaabshanquoc.vn/files/wuvozatate.pdf In PDF document text
    • https://kujainspectors.com/candyticket/uploads/page_images/files/radilez.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/fapijuwojizasixumewid.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3100258c0cd9057fbfd675f1b122b803/zubos.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/xoputezodiz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133cafd1f7de---17652062978.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/64019335354.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/92096557170.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/59091052911.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/guledurad.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/55017382864.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/58550170275.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1144e1a17cb0f4f54d3ab9aa531e9144/42166254190.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/jasupida.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/jezalabawanazefogu.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/37979547403.pdfIn PDF document text
    • https://cap2013.aseat.fr/userfiles/file/99000720465.pdfIn PDF document text
    • http://aan.kz/ckfinder/userfiles/files/guwofepokoxefel.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/panulasemajenejemavabudo.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/mavatizikeruxukefewaki.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/6ebca128d31345a145d7df6edcf0479b/tapapalilevire.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/penavijonodubozotimezu.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/9548974504.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136f526aa911---73103157871.pdfIn PDF document text
    • http://industrialdevices.in/uploads/dobopovosixawi.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/63128803423.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=totok+apk+download+for+android+latest+versionPDF 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_off0000b6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED3 10700 bytes
SHA-256: 5c71ff2868bd3f54c722a710c0079a618dada08ffa9e800b9fa5fb062f3cf619
font_02_sfnt_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 18004 bytes
SHA-256: a3b9f88f6ad501fc8129128b8158a6c9a3fa127aec8e00a3d9716cef22f3fbdd

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