Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9ea25629387dbfe…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 00:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0991e3e150a8f8f19130ccde0ad71607 SHA-1: 03c026e0865198b15fb58c9d4488362d8bee13c2 SHA-256: b9ea25629387dbfe1acd994228eb5b11e0435c4eae5c33891f914d43a6267828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are identified as link farms on disposable or compromised hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://mebel-moscow.com/content/xuploadimages/file/wadarizumularuragupam.pdf In PDF document text
    • http://vigen12.com/userfiles/file/70886523103.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/73950252938.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/babaxadexoxevizizoros.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/xogovuzuxijomenukoseros.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613032a943d29---nurepajafokenofur.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/limebemuxozozanazurux.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/sajozexof.pdfIn PDF document text
    • http://fullx.net/files/famolijonojilale.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/45467658582.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/farujifogixarulu.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/fidadilubobalitowaluxaxav.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/19750209980.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc1f2a886---seluwupa.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/watidavoda.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3513d15d50f85755ed1e731a59bd2f37/vatojokosu.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ieub02joki16n389g0bodm8jf9/36808267813.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad9cd3de34---bidejalugiweforiwe.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/29821437022.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/kogisewudunizede.pdfIn PDF document text
    • http://wsm.hk/images/files/91945027107.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/356bd29ab906331ecb0b6a27983f2bb9/96332440965.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/liwomekagiguwapexuzawoba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+find+gallery+on+androidPDF 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_off0000d567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD567 17204 bytes
SHA-256: c6f13ef85497d7d7ba32adb8e0190a89855cf7980d601284975d98eeeafd622e
font_01_sfnt_off0001022a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A41 10552 bytes
SHA-256: cf61ccbee9b67e0961746bc4f8f5bd8c94500b3e71227cdb74b1cb9357e480ec

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