Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8e13482cd5d1c5…

MALICIOUS

PDF

72.2 KB Created: 2021-09-11 13:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4960ae7505b0203c5066f34aaa3fad20 SHA-1: 32acc5af240d69a64693f27909c93067e485cc96 SHA-256: 1d8e13482cd5d1c56d1e8540c2fd27bfcb7883cbb78bef0fa56d395076880cd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=best+drag+car+in+carx PDF link annotation
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613470c7ddb36---fopuz.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/lujuxafi.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/36875732381.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/73195363462.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/wowukemuzekokujar.pdfIn PDF document text
    • https://accidentmatters.com/ckfinder/userfiles/files/35440448871.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/64375015546.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/880f9b3e2669a7a62c8bd942b022fc60/mugomip.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/97387418097.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/43178659913.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/625651387.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/25625316399.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/39582626011.pdfIn PDF document text
    • https://pecsikult.hu/files/file/50402015762.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/g41o86e2lmivs9vidrvq2f7rfd/kafajesazedubosuzatisofo.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/70534156802.pdfIn PDF document text
    • http://canoeing.by/pics/files/13483804494.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/puzopiwul.pdfIn PDF document text
    • http://polipack.ru/content/file/vosuxigibar.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf900538f---sasejipixorebukupaz.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/90220757872.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/nefesawolanuxuvabije.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/75130754414.pdfIn PDF document text
    • https://hunglivet.com/uploads/files/202109031324193882.pdfIn PDF document text
    • https://kimcert.net/E/file/72463699070.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_off0000b745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB745 17052 bytes
SHA-256: 8dfc1aebfdc5af2da032739e18f111131d082793c0de73459e8e37f3656d49fc
font_01_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 10536 bytes
SHA-256: 237ab189393c7fe2aa8bee174ca52abd9250ac67df1dc283bba319b1b71f1c5d

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