Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e9fa4987ed2c0a…

MALICIOUS

PDF

75.4 KB Created: 2021-08-27 11:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8d497739d0e3db3b4caa16b16c9faa6 SHA-1: 84790f5ada4ea186f1acffcc5a5891a0c13e3c89 SHA-256: 71e9fa4987ed2c0a75e9c0c917a4a7871d98f8e3e211adccb0fd4ec61902ee1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=planting+bare+root+astrantia PDF link annotation
    • https://www.zolmedis.lt/ckfinder/userfiles/files/voxova.pdfIn PDF document text
    • https://philcoastal.com/ckfinder/userfiles/files/99677753397.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/tifidilugawa.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/xekilujevarat.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d924f82467f---genulovexaz.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/nizakizimedudikeze.pdfIn PDF document text
    • http://skomi.ru/img/files/file/vufesomu.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210824_173339_183.pdfIn PDF document text
    • https://digireg.si/upload/xufosewegedirikozugaxine.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/kevulidevosakibokitirerub.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4ebd672d---lusigalivafulipoga.pdfIn PDF document text
    • http://robbes.nl/media/files/bimivazom.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609630af0ed30---vizadawotapoki.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/gagolofuraj.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/57950341739.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/6718435264.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/9422588829.pdfIn PDF document text
    • http://france-ex.com/images/blog//file/gapuvoxevifafupeto.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/gepcfjopstq8n1ehla0fml232g/85462188592.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/89694064642.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/40874434507.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/ruladufekasobenirimejozod.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/legog.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/acb2a99338c3e141221c5dab8f06636b/91812411590.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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC56 10424 bytes
SHA-256: 7aaef18d3011cce00c1d5b64e5aebfaee97ff34f459c84059c1c5dd9a39cb8c6
font_02_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 16968 bytes
SHA-256: ecfb676c8f554ca2e5f41b22d37c44827ee875942f8f946af0a886bef12a8587

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