Malicious PDF — malware analysis report

Static analysis result for SHA-256 7458c5334081ea09…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 15:56:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d131bcba8726ca503005e2cc576506fe SHA-1: 83962a3aeac4ec9b8e8c0265ca6de670e733f008 SHA-256: 7458c5334081ea09236bc6dc6a00998b038037f28de6e7812f38c1c35595eabc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of external URIs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions beyond simple redirection. ClamAV detection further supports its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://uzks.hr/upload/datoteke/9471658589.pdf In PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16126f60e62ea9---56676119759.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/javodaxunebiwidedan.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc2de69295---81608418558.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/71587344196.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/duzikifejubonogovibit.pdfIn PDF document text
    • http://short-story.ru/upload/file/99831304849.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/mewanasepofuwesinov.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/bebutuz.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e93ab13f792---13536282513.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606f71cb1e4e7---27450053267.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/60631564848.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/gexepe.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/31171178314.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/64887308494.pdfIn PDF document text
    • http://hokeypokeychallenge.com/clients/7/77/77ac66e313b6cb4bf602f1678accca72/File/48969607707.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc3b8abba6---pefalimufigeb.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ef8532925---50155995306.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/nulibijovudud.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/shmvthd1d2s1itgkl3imd75v45/talidi.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/resuv.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f28951614---90230359140.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ambiano+egg+cooker+manualPDF 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_off0000d8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D7 17768 bytes
SHA-256: 827d172c0398ca44a052c9d79acfdc3a0e8c4e322c9d6fa9f95a4fbb1c7f87ef
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F13 10620 bytes
SHA-256: 1eadb039ad52d294dd5d25c39a967c19e657a24370a574334e28b34fc35a6d8b

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