Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71f5cd39467396d…

MALICIOUS

PDF

89.6 KB Created: 2021-08-13 23:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cf49103deb6f2a96299421e9097459b8 SHA-1: a9def841e6c8a49793919748e06b4d582aeadddb SHA-256: c71f5cd39467396d6cf897f9569914e9dbfc3a926456d11c590bf6c1b5a46fac
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other domains. These links likely serve to distribute further malicious content or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://stattus.com/assets/file/21164866942.pdf In PDF document text
    • http://chinoboxingclub.com/clients/36032/File/17555934456.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d0361dd3d68---dezutera.pdfIn PDF document text
    • http://jonmechina.com/ckupload/files/486837136.pdfIn PDF document text
    • https://curvy.tw/upload/files/12018236796.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a74886b21e8---39422369253.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/tujodaf.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9c7090672---vamomilifow.pdfIn PDF document text
    • http://austintownfitch1980.com/clients/879833/File/pudamajinake.pdfIn PDF document text
    • http://centromedicoveterinarioadda.com/userfiles/files/2489214657.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a88643bd84c---77080629800.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c936ee745a---muwonogidugaputopimafugi.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/c57f3adeca95a888b9fb6a7a0e3154fb/baboduxuganasiragi.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b1ca1a83b---depirenusararonusif.pdfIn PDF document text
    • http://islandpointfl.com/userimages/57169669170.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/gr1jkugh75o0avcamgfona4ne5/napejaki.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef1bc490d1---dotutelaxulubog.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/bodopodoriweloruw.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/zaboganafamuda.pdfIn PDF document text
    • http://araonline.hu/uploads/file/45918604028.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/1828a8dc416c4922960fac583627b723/44022636612.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de76d6c863---tusefazapofikeziwip.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/kuxurojibileninoduperofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=lego+marvel+superheroes+2+free+roamPDF 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_off0000fa54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA54 10752 bytes
SHA-256: 1bfe28546ecd51e1714d871624cc1d69104099d2b809a8a532fe5043bf4c9868
font_01_sfnt_off00011323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11323 17368 bytes
SHA-256: 3dd7a7b40295379d151252a78f3a95adfe06e9481f90923c8338978671082807
font_02_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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