Malicious PDF — malware analysis report

Static analysis result for SHA-256 5945fc9625d2028a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 18:05:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3a02fddd9e0587941056308d07c4874 SHA-1: b2e82a373acb54917ded5e202ad484feb050e95f SHA-256: 5945fc9625d2028a35cdea63e7fa0ecec2581af152435107cba47f99858672b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, directing users to numerous distinct domains, many of which are hosted on compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are used to distribute further payloads or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abovomedia.hu/_user/file/48238217895.pdf In PDF document text
    • http://yugang360.com/upload_fck/file/2021-9-12/20210912232050197808.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/risarodofegu.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/dapuxegafolujalukotedofo.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/nebesadiwezerudumulab.pdfIn PDF document text
    • http://sdes.in/uploads/wibutusagol.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/3093994794.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/jekusara.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/wofizalosuwidarajet.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/kopoxolivotodatirun.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/88058528490.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140ac308dddf---tarasoresevidop.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/92005721897.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/gd9cf9e3t3110k5t7si9tl9tb6/telivutun.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/loxusazufoguluka.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/gaxojidezateleladikolezu.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/wusejoz.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732a859807---58329550290.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/94a0e17ab06231ef59dab1d301ee4715/dabigafule.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/93012843751.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/zurotadunovetupulesuxobi.pdfIn PDF document text
    • https://equipelec.fr/ckfinder/userfiles/files/zinogedinogomuwobixalijis.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161405f3f16bf6---56992062974.pdfIn PDF document text
    • http://satthachkhe.vn/image/file/61485638246.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/81896344740.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=keeping+up+with+the+kardashians+season+19+watch+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_off0000b2cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CC 11388 bytes
SHA-256: 29f0b11be452e6d0d6a1ac6a18fa9c646214420d51b2eb7343daa944d44d5557
font_01_sfnt_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 15564 bytes
SHA-256: b1c32a6631f2117287a5f7a7031cc58ef749c95bfa32286f6ea0e6592d069a01
font_02_sfnt_off0000f4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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