Malicious PDF — malware analysis report

Static analysis result for SHA-256 177e23748372335a…

MALICIOUS

PDF

100.1 KB Created: 2021-08-13 06:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c04dbd6f695fc80055dd1e0bb1fdf275 SHA-1: 06231b58b72a81b119eced92cd7019628727dcbe SHA-256: 177e23748372335aa470f36ade2a1ec95694827a1162955b60dcdf9b12e61d20
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The PDF structure itself is heavily obfuscated, and while no scripts were explicitly extracted, the heuristic firings indicate a malicious intent to leverage external links for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608944be7529b---63804769818.pdf In PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/58n421ul7di78jiav6iermdhfh/fodofogebo.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/35580625313.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160780f4c2bc81---71833020213.pdfIn PDF document text
    • http://hmconcretemixingplant.ru/d/files/musifawijalawejojise.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8089b7e9b---57905742294.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/82831555241.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/35699815966.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/ob12v3bpatualq4qcerg0v93b4/83610171175.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/7bhce4s5sqbcogqnb8240iqsum/38550139043.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/nekizida.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210719070140.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/nijatedegadututosegofes.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b4c9c7c62---jinimotumo.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/zilurimaxuwonixifodux.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/dupejubedowokoxavekejuv.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607824482a16b---47655002729.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b0db86c1303e10a00271b6d163a6c7e1/bubugokeje.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160e381c1483d6---16662572785.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/cd5c86c8faed97a47fc09c25d4b53497/vogerofajigeravawimojasu.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072e30ab6da2---gexadewabegubawosix.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c28e76be---77461366690.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/junofumegegutomegaxakaka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=tab+guitare+les+portes+du+p%C3%A9nitencierPDF 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_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001354c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1354C 11044 bytes
SHA-256: f8f3ed04234d329eed359196f30c47a0c6ee647bcfee5dd0cbc7e99b5a76773e
font_02_sfnt_off00014e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E6B 19788 bytes
SHA-256: 356c56eaacb6c9f3982f4b846f4e6f39cc308d83482a3f05cbdf436dc2cee6ad

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