Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d673171dd61cec5…

MALICIOUS

PDF

75.5 KB Created: 2021-09-03 00:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 77f770cf03dbfdc2c50d2663679075f6 SHA-1: e73d8aa005ade3a9f7e5f2ba7dd152658cf2c9cf SHA-256: 9d673171dd61cec56ae2e187fb517e0950b5866cfcac82d0a7dafcc24ee01cc2
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or are hosted on disposable domains, indicating a link farm designed to lead users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://greenbrier101.com/userimages/waxupogezuso.pdf In PDF document text
    • https://alteanetworks.fr/img/file/pixofeku.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/6grgoaf8h1ut8idi52pu9n47h0/6486908051.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/zebaxozukifijuganekud.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2096b4ed---67463235835.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/64434855260.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae380c5fc87---welitufebebokupetup.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/41232103174.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7f615aba6---gukizamo.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/31235456682.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/mevotuw.pdfIn PDF document text
    • https://tadimtursu.com/image/files/19530124592.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/rn83lon8e474lvcaif0nf8135r/tusizixufomekazofamikad.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/lulorumejorepekinefo.pdfIn PDF document text
    • http://cepsagibyachtfuels.com/images/photos/goxavir.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/rurozedukitopasa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608522bd04f82---xowajeviwaluzamefi.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/3d580036708dabb29306c5410cc1e45e/viledadi.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/wewodumerowe.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a61500a822---80124335058.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/od9dgfrgkdequ0ac71en91ivqu/33975906302.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/82818298268.pdfIn PDF document text
    • http://domplus.su/userfiles/files/68279185756.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/90707833005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=il+cavaliere+inesistente+pdf+downloadPDF 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_off0000c29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC29C 17332 bytes
SHA-256: 8f6e171d2bfcb174ebf6e1ed40b7178979883d3c8a1104f9dfa0d1123530bbe3
font_01_sfnt_off0000efc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10716 bytes
SHA-256: 50685f9cbace49382babd7b83a356ab9b6bd9f49cccdf3eae922637deb04ea29

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