Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9b9dda682a2f743…

MALICIOUS

PDF

84.8 KB Created: 2021-09-02 05:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e87e5ae58b595a474cdee1dcab3bc63d SHA-1: 23feaa70504568efb46696376f7c5da2b4bbee58 SHA-256: f9b9dda682a2f743adb97e7d33cb8ba2ae748e7568e4d2d214264449437967df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various PDF files hosted on compromised websites, likely to distribute further malware or phishing content. The use of compromised CMS upload storage and disposable hosting suggests an attempt to obscure the true origin of the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609c94ea61f8e---toduduni.pdf In PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/80346741373.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/telemizonuzomaderaxizete.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/39335075979.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/29421192062.pdfIn PDF document text
    • https://digireg.ru/upload/89889212045.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b675bfc0d---66870126392.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084b1c671189---zutizepiziwi.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bd7689987---nigokojemijuzomim.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/tozatanomun.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/tudalipevalarukaf.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5d93618321d600ad7a245a15bd34d60d/xevavekexadesiroze.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a947af988fb---mijifikupam.pdfIn PDF document text
    • https://jagamimpi.info/contents//files/tupizawulenitefu.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093bd8ae5566---27681858265.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610b470fbdb3b---tuvifigaselonodixemi.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc877a8a22e---remamegenerewexowigewuxup.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/88135943618.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/9797870541.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f55e84fcd---74160115579.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/loviwenazeman.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210519113352.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/95496146346.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=portrait+photography+books+pdf+free+downloadPDF 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_off0000e44b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44B 17688 bytes
SHA-256: c8ab54679cdc4bab39ed10e5919471c4ffe5d2b6f48a3a0c2c6a37f697a802a3
font_01_sfnt_off0001123c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123C 11208 bytes
SHA-256: 383b4cf284f367f96258d40d13402608b8476c967bd0be4ace75008d833bb8ef
font_02_sfnt_off00012c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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