Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e67ca85e65ef522…

MALICIOUS

PDF

80.6 KB Created: 2021-09-05 23:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aff2ab9f796295c1965aa5c68e6bf9fd SHA-1: 5f20b500951351d8d78e4eb385b3ee9f206c74c0 SHA-256: 9e67ca85e65ef5228997e4551dfcaf2e50e9e1d1c9ad47f7b514b2a13f11dab3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to external URLs, as indicated by the numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly support the malicious nature of this file, suggesting it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://patrick-vallot.com/upload/files/bifesusixikazijuzasukobal.pdf In PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c916caed---kujiso.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/zikemifuwowikugiliv.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/46429927710.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210723_0477933D11F587BE.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2c2676d13a1ae96f96e863a80259cd20/10830407432.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/95347889877.pdfIn PDF document text
    • http://jkbprivateiti.com/userfiles/file/38521643572.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/b6307b3b33d06ff99af944986a1276a0/86740795128.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/41538446956.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/pibiviwabazop.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bb6debf72---67826776898.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jb6kc4i3shq02olsqj2vaifbd5/dawabibilub.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021071304532373499.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/jamiloromefujova.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/p49266297p742p2sakle5vtg50/49550086233.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/zirafenubivuborozodinilil.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bv6n3dkrh1o9j7ued2alinbfs5/setozefaki.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/d6621db77ef3a766caac66aa2dc24c7e/66653129294.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210903/2309099620.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=reaction+of+glycolysis+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_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 10852 bytes
SHA-256: 1bf8996e4e9e39aa77a7d2def7a1065fc0df231aca91f442f997632e625b57af
font_01_sfnt_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 17940 bytes
SHA-256: 90cdb5e2fec79ce6ed245bc10198c219758f73b24d10d9d67df751a00f2c60f8
font_02_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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