Malicious PDF — malware analysis report

Static analysis result for SHA-256 22ddff4195c1c081…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 09:24:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16a346e97a04537e08e8f066654c1ad9 SHA-1: c6c8556429d0242ea62e720fe791f88a4d907fe6 SHA-256: 22ddff4195c1c081ce84fea5f2f76d8d0f069fd803cba59c956ef44e763b8417
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous links, many hosted on potentially compromised or disposable domains, combined with the 'Fake invoice / payment lure' heuristic, suggests a phishing attack. The document's structure and embedded links are characteristic of a link farm designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://kaupa.cz/userfiles/file/depinofexofotilebezif.pdf In PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/35957618061.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/lulavuxarefilasega.pdfIn PDF document text
    • https://starbox.fr/img/files/72136717359.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/majavipebozifojonudebe.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160806cfb403e0---xeramuxewo.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/lofafavugasesum.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/sizitixafuxowa.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/56093056614.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/lusixudupasel.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c76e277934---61203170998.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba917fdfa9f---neximefefevuse.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/61079525799.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/gozivazupegekopunu.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b4c468c4e---2517491747.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2aa71696---62653552268.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/sizepotulelorotukujemefu.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/tumikakaseposeki.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/84254453306.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fbbbd381b3db27ff03728c387776705d/99264906078.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e666187e3b---nezewariziziwimikorawoma.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd269c49da---83643469584.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=accrual+accounting+principles+pdfPDF 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_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 17140 bytes
SHA-256: 04c5ace2b0f6e1fd9f2f534345c0299aac4ac1355abade1d7a566667d381a83f
font_01_sfnt_off0001055c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 10876 bytes
SHA-256: 1f67117dda9af99afdb6bd497c85c2ed3b72cf7236a75f74369e148014996ae0

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