Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa17f4c466f0e76…

MALICIOUS

PDF

114.7 KB Created: 2021-07-31 00:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 10465107167760e53c440bb55d37856c SHA-1: 1e8672e8492d366f940da9131433e6a0fc5e81e3 SHA-256: 5fa17f4c466f0e769ea8e844f9ca4cc2becacc865d2e137b24842710cffe7fe2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. The presence of multiple PDF links and the 'SE_DOWNLOAD_BUTTON' heuristic further support the attack pattern of enticing users to download a file. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bmat.mn/uploads/ckfinder/files/vofagusadunegawa.pdf In PDF document text
    • https://powermailer.in/userfiles/file/tadoxeruzif.pdfIn PDF document text
    • https://nada70.org/userfiles/file/xazudetotosubudi.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1dd611cc5---80689722922.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/rj80ukvfgv8ruh7pgjtuhlfof4/bipokedakirivofinu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ed2b6237174---jawiketedeleretukufetado.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/23225130677.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/14225439217.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/ripoge.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/50cpc9q0okkpm914suie0l7tnc/29238526749.pdfIn PDF document text
    • http://elm3rad.com/file/kidep.pdfIn PDF document text
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/lezarekoruwopig.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/n51ae0h0mbiae5dubqv8264n13/daxarugowibijelozelug.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e05d9129f---notiz.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/32303868817.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/88632437251.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/22420074624.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f355af16afd---90482883141.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b32bf2edec---jidomuxijozaxetu.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/rofuf.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/895636365.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/vohbv30irbnrbj5o3gg5q0nv2j/xuxinemorixegaseva.pdfIn PDF document text
    • https://europartner2.pl/uploads/81339120176.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9mk7cvgu43chcvc57i8k9dcers/zizotiz.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/zutokipib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fnaf+world+update+2+download+unblockedPDF 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_off0001617d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617D 15900 bytes
SHA-256: 8101e3fd19a5cdb47808830d0b3cd3a663bf4f4118bc1fbfa1fb5c7d50638b58
font_01_sfnt_off00018a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A267 10868 bytes
SHA-256: 64dd1b3be7a1e7dd695453a39fa2053058fdc3061ea56a2c6347cb6e0e9cba80

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