Malicious PDF — malware analysis report

Static analysis result for SHA-256 b851cb83cfeaf092…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 09:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ee1fcf243c7a97161cfce55c851af62 SHA-1: eb353dd3905f41fecdfc07aac1f988bddd187d0f SHA-256: b851cb83cfeaf09226f1c9fc5c7894cb5ecf00283c1cbeadd205a9f2f08ab8b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://beauty214.com/uploads/files/202109031604467373.pdf In PDF document text
    • https://excore.hu/ckfinder/userfiles/files/15153351860.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/tupega.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/joxevaxalezenewoxobakef.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/34106826968.pdfIn PDF document text
    • https://macjiboter.macjahisa.si/files/file/51841060799.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310b47dd564---gomazukowawamu.pdfIn PDF document text
    • http://www.first-classlogistics.com/image/upload/File/48712503561.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/tikujibimugom.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/21d6etqfo4la0iv9upfd51aafh/82117749723.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/55554396397.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/57194099195.pdfIn PDF document text
    • http://isgsrl.it/images/file/zunuw.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/91933304571.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613908f156ffe---59816486488.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/36962186151.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/11985444688.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109152153367386.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/fufadux.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/15426100181.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/48821245590.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613851871d73d---pipifilijas.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/51767797135.pdfIn PDF document text
    • http://rafaelokazakov.com/file/mimowog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=the+fast+and+the+furious+online+freePDF 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_off0000d6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B2 10516 bytes
SHA-256: 54c890bcebdb2b846490f731d77483e13631672306f7e8d4cfa93bffa783639a
font_01_sfnt_off0000ee8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 16816 bytes
SHA-256: 405200ece4c0ff761cc0ec32c180554d51b86a8a78afa827922f9c24daeb317c

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