Malicious PDF — malware analysis report

Static analysis result for SHA-256 694decdbbdceb1d7…

MALICIOUS

PDF

103.1 KB Created: 2021-07-20 22:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8377de2cc83f7ce81b90b5ef9f03ec7d SHA-1: 95b4387bbe0cde0e4bcf11ee14ac7587a1d789ef SHA-256: 694decdbbdceb1d786650f8c517d7287d7001ad4f05f4b0b8d72c977bb47182d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites utilizing the formcraft plugin for file uploads. This suggests the PDF is designed to lure users into clicking these links, potentially leading to further malicious content or exploitation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee0634b768---39301195154.pdf In PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4658783284.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076360caf309---zomoxazelufulamopej.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a315d5cc4b---rujijafonuvaginowivij.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/68421718857.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/kifikokejaxefug.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfa065281a---dibizerorazunupesi.pdfIn PDF document text
    • http://mebco.ru/images/file/xidipoturotug.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/78082073477.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/satore.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/zowetimiwivizozavaneviru.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95668db8c6---vifovirubiwawam.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/dawijevusebubodola.pdfIn PDF document text
    • http://belst.by/upload/file/bevolufat.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-3/20210503233206637052.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66688997076.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/waxavilipobogulekazukapo.pdfIn PDF document text
    • http://salkim.com/userfiles/file/29101321268.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/wutezalojigimotipedidolu.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/pebugafijajapiwubox.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3859a4b79---fazilolasalunusuvuroxaze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=electromagnetic+and+electromechanical+machines+pdfPDF 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_off00012a90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A90 11048 bytes
SHA-256: 21c940d8ef18dbab6a469be19044e8a5ff39585744aa4d0085f7c670908e10c6
font_01_sfnt_off000143d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D6 19224 bytes
SHA-256: 715de083f29c43f4f1bbb592d43f59c7e4e43b11c349112c8df2f0e8c232c493
font_02_sfnt_off000176d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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