Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e09976829a9968…

MALICIOUS

PDF

101.6 KB Created: 2021-07-26 10:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a3679b01ee03075687d87a092d6797dd SHA-1: 4f2caf73409d4260379851b6042b502508026ce5 SHA-256: 41e09976829a9968d26da72352defd7278c90148c4d0fc92bae3b34b1d3d7567
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to sites that host further malware or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/574aa63035e7bda9acfc4b51c1876ed1/52022212751.pdf In PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0eb1f2aed---rikenoneludar.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/35879f0892e78ecc776e07a4128f3654/bigizox.pdfIn PDF document text
    • https://retta-bg.com/userfiles/84349524233.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608015c98e8b5---dumewilidiwowifokuwike.pdfIn PDF document text
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/er852ncuiqpehq1km7vhcoi81r/68018483402.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160788b80967f8---36139777398.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609456d3cd247---86344561334.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca671534c8---ferematisu.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lojivesimarenagujoki.pdfIn PDF document text
    • http://5percent-design-action.com/upload/users/files/barukezonigakanuk.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/45343788053.pdfIn PDF document text
    • http://amrapalispot.com/userfiles/file/17329621754.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/mutudoxulubizegek.pdfIn PDF document text
    • https://scalper.ir/data/files/file/95928594326.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o8e0m8n89hab81f4482upl2re1/fupogujovuxusufovonasow.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/69b878b923dc6960f7df2697766b4d77/datorazagotepijefe.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/45302733012.pdfIn PDF document text
    • http://jarosi.hu/files/file/64958397645.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608713d7666b2---mipofasuwupenobabaxogi.pdfIn PDF document text
    • http://alexsrmenchion.com/clients/b/bf/bf5401b25fe3457642f5a6f1150d5537/File/41264046339.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c42b1c6d3---xuvube.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f55ae2ec---24782665729.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a079d04cfff---59373571676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=chapter+23+supplemental+problems+series+and+parallel+circuits+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 2972 bytes
SHA-256: 0be2af13236ee21cae0cc5e662bd69457f646543b837afc02ffd4ff0a50549fe
font_01_sfnt_off00012893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12893 11428 bytes
SHA-256: fc93a3123015e902345e7374384b74e01462a9a168ebb765f976c13204f2e349
font_02_sfnt_off0001434b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1434B 16960 bytes
SHA-256: 3f28b0a5a3fdd860615ce7615753dbfdc6c121a227dbcabf06c5106d479f35d4
font_03_sfnt_off00016f48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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