Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe879b3760183c5…

MALICIOUS

PDF

84.5 KB Created: 2021-09-06 04:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ea28207218e2123546a6019a94d7163a SHA-1: 00487c22aacca95c5074fa6d207c00a55879a70f SHA-256: 2fe879b3760183c54fe2ea7940fce7bb9b76115d80192c167f32b39685efa52b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The presence of multiple links on disposable hosting and compromised CMS uploads suggests a deliberate effort to obscure the true origin of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://archism.ru/uplcv?utm_term=uk+trade+marks+act+1994+pdf PDF link annotation
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83994992aa---264248958.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160925daf5394d---bodobak.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/41859554873.pdfIn PDF document text
    • https://mimpidia.com/contents/files/bagawomunuwivikepigu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/lr17h0hst7k0jetioitgt4u9dk/lelavapelora.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/pmsi4ltjl0qvent4pvekhg12d1/lekakodefolajozo.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607f057c36f25---42701694137.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796298659f6---58672539961.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/89446018214.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bafe279dd7---mopuluko.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/noxub.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/96576403368.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2d61d30a3---xodogolamiliketu.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/2dd11c79faa78151160d4f025235b94a/60831890352.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/33692529733.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/8871607357.pdfIn PDF document text
    • https://bdblue.com/ckfinder/userfiles/files/55806446580.pdfIn PDF document text
    • http://zl369.net/userfiles/file/kefok.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/26083747282.pdfIn PDF document text
    • http://wami.cc/data/files/lebebapodijimol.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/kefuki.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103757fa34b4---pusofebowe.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607232e4c370c---46008060308.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/zedatebubozijet.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/90271677439.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_off0000e6e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E6 17208 bytes
SHA-256: 7799b2de220b7863ec1456b1ffe5f50731d1827d60d33439afe5cbae0c3bbefc
font_01_sfnt_off000112ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 10816 bytes
SHA-256: bc2a25af3d66ac39d71fc954214e55653a8d62cdf5a7264cbae9c43d82e15623
font_02_sfnt_off00012c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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