Malicious PDF — malware analysis report

Static analysis result for SHA-256 999f01f14ea01610…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 19:12:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: cc6c736568ba411cd7ed9c8fb0ff8478 SHA-1: 7bd33b9e52f2fd97cea2e2a87fce229060eb938d SHA-256: 999f01f14ea01610a76a5f9b0694c1382be388582e32b60925b24ecc5a02aff4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The sample also includes numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f737a0253a---tofenusub.pdf In PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cab1af059---besopajif.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9bf0d68f---loboxojogux.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/90758801422.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115c61971d8d---98808268204.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4c70860ac---getuj.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ppgehdionkt3snd885nidenpjj/dozopewomilidipu.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/jodibazefimeravujosuwu.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/1274991924.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/wejem.pdfIn PDF document text
    • http://dsagco.com/Upload/file/54456792672.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5a4be6028d---goropoki.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/41186838294.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d70fe058c---lipuzefememolalupikud.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/gopiz.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/c3a556f4e97d71663329e59cc69a418a/4611831413.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/bosuledu.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/14959964849.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/15012857087.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/nesapim.pdfIn PDF document text
    • http://ccsl.asia/files/51278689391.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/e51366577d64079ed503dac702eef115/80158644077.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/13342433435.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=phantompdf+merge+pdfsPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8557c2f66f---gusujuxodonukomokamu.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_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 10808 bytes
SHA-256: 3097547802a69e1168ba62b5a298303db0a6ebb8114e4f6bb71776af066da1f2
font_01_sfnt_off0000f201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 21652 bytes
SHA-256: 1b1000b1ae17618f3cca723b3f0baf28ba70650354d379a56ece9a60d93d98a8

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