Malicious PDF — malware analysis report

Static analysis result for SHA-256 3015d872b87ab7f1…

MALICIOUS

PDF

78.0 KB Created: 2021-09-02 00:36:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3369c60660846864f6e4e5e238a0d1dc SHA-1: a3fbbce5f6fa992c0c9d5bfd5b16668f6e62b100 SHA-256: 3015d872b87ab7f1c608474be7a390560e72fd1310255778528c0b318d133b32
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many of which point to compromised WordPress sites 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 URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071312ec3c2e---42942282154.pdf In PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/juxafozofinizatutodunid.pdfIn PDF document text
    • https://coopinproject.eu/ckfinder/userfiles/files/91797688052.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/e53b77vsonmlvch19jpn3i0ag5/ronubogod.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16108dedf24f0b---vubuli.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/54647146161.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/15834846814.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/fitagijujoroxokezun.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/patstevj53r22hdmv24pteote3/tulegala.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/56176410702.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/76716342251.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3534d128e---bonivemijasexiz.pdfIn PDF document text
    • https://pk-kuepfer.ch/ckfinder/userfiles/files/sebenetokazofidomam.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3fd71613---ditivajupubarodajolasi.pdfIn PDF document text
    • https://rhodium.vn/uploads/news_file/11525495136.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0431a3f9a6---18904033339.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210726_1A6F60AA21718BA6.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/68435807263.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/fatopabimesebi.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0fa5e365---giwigowagajowelajavajapeg.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/uglk5dtn203gvhnh64sjhlchbk/bikaxofega.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/11377616719.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=microbes+in+intestinePDF 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_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE480 18524 bytes
SHA-256: 69bde61a2184e6d586c5ba10ba0f8750bd72d80cf545222a7b61bbef26757bcd
font_02_sfnt_off00011305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11305 10148 bytes
SHA-256: ca7cb0c36d83f8f4f75f1e73a99fd1e79e3331b777de373f432fa6f35fbb0afb

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