Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa716a81500456fa…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 05:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3d89a1afb607e0ff7c34742c8ce80fdd SHA-1: 4c4a8d73d6f99f570022809d743361144ddb4715 SHA-256: aa716a81500456fa66d97a509ba5647c465d9e068ce838a18b6c6733dbf63cca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=elements+in+a+communication+process PDF link annotation
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9f52314fc---19349539204.pdfIn PDF document text
    • https://atrax.hr/files/68880799033.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/99054563139.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7ea08581d---wabaromafevofi.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/43807668380.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/karim.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21191722105.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/mexaforivikiwugi.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/67d91c0335e918602e560f648b2acc38/nojejolerurivumutib.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734115a940e---vamolofawesewotidisopo.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/97769888180.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083cf74dcf69---5348222743.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/nutejawi.pdfIn PDF document text
    • https://stopserv.ru/files/file/fufikulawikonimemafuzaj.pdfIn PDF document text
    • http://vaonhaphatphap.com/images/uploads/files/5645144923.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/87318786558.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774fc3af782---84071920676.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2cec572d240fb27f42fe605a4bda5164/sipalumiwaxekajexiji.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/pozidife.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/nilovijowivipafaj.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/96677457459.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c64fd7528a372123a1e61ef49d146c7/jofonulowupa.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/jivir.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/jixozaguponutalev.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_off0000e712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE712 17004 bytes
SHA-256: 1afa94e401285d652f279f28ef6dd77c369699e2420dcb9906279aac9daa70e8
font_01_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 10620 bytes
SHA-256: c49259690fb952738397655f9e170be340c2f5e1fc29232141825fc13d5dcfdf
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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