Malicious PDF — malware analysis report

Static analysis result for SHA-256 7847831feb65180b…

MALICIOUS

PDF

113.1 KB Created: 2021-06-28 01:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df91b4340341e9a9108b022292a42262 SHA-1: 9629c380cee1a50d17a2a957719f11d576e4cc04 SHA-256: 7847831feb65180b60613bf633c68cada23766108f30669e5c73e6d408231276
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute phishing content or malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent.

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://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/le4p0a10oa20h2816459k1d8d0/51308592471.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/1jr6v42dcvp0qb3q0q42f46dso/lojodojunazafajevebadowog.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a2f52b85b---vufavelipatebuf.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/sufubujujikaruniziwuv.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c24348d2c0---bodafexeturobaji.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/5dc4ec75af6db746ee224787cd3382b1/80969610022.pdfIn PDF document text
    • http://mesterek.net/tmp/jelifutubitoxifewujip.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/ganipuvevotonufigukutuz.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/a81fb7783d08aeb43025441507cb6cfc/kavowarefezazikuxowa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2ecdc5437---71961869831.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fozusesuwetofu.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/77089602565.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bddd3ea5bf2---vewanave.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/04898d54db24576a6140ba82c3f563d8/limapali.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/33247468305.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f15f61bf47619d1cc1f87492c15b8e73/72220136109.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/bcc1039ddc5b07c6c205b94f37849f9f/40588667414.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d187c4c0206---48000624401.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/64264e9f704e4c2195f1c12d969c2558/63271063152.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/wedatuxonedoj.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/1732214085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=resilience+meaning+for+kidsPDF 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_off000157a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A1 17872 bytes
SHA-256: d52ef5a1cf34446808e85f53872b8c23c340c1230509776453c48594c7117672
font_01_sfnt_off000186ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19EC5 10856 bytes
SHA-256: a30332af4e0e5beac922b5784254ac81c32907ddf8a02d09c3bdb66127a38f60

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