Malicious PDF — malware analysis report

Static analysis result for SHA-256 451817fe7d7800a7…

MALICIOUS

PDF

75.8 KB Created: 2021-09-07 22:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dd0845717796b412ad2314cd5adf69b4 SHA-1: cd5ba1740b35ac8ecdc6c07fe28bdd59a07fcd83 SHA-256: 451817fe7d7800a72ecbd05aeb037bb9fe916fa914cd957a8da617b34fbd5940
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The file contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to distribute malicious content. While no scripts were explicitly extracted, the presence of numerous external URIs and the nature of the heuristics strongly suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607de8d7c34b5---34087802280.pdf In PDF document text
    • http://illinoislivestock.org/userfiles/file/94600449572.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/19871a222b149f4ff58d8b3bc9a79425/90290957995.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7319781d0f---kitonutesikedekobozug.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/dejuvizojetajob.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609476a826246---61365295744.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/loo4t59u99tasr9l1epra90dn6/26672762831.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/zobakukemofuwoxepawupa.pdfIn PDF document text
    • http://iccarrentals.com/files/file/solutaluku.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/8pjmh1j0n13c8bcvgen0d4n6b2/53097005925.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6bda4b2bd---noguxa.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/53679153099.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/83566952824.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fe4a20db---53575044772.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c379b7cc14b---viledikupimamizarowarew.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/samasirubofoma.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160947ba52e619---kujewoku.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/xobigu.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/doriboferemuvido.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/tosovu.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d95cded65---subogizenanuw.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/203502460360ac94fad2af2.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5eel6121ml74eae3rcch0vroa3/zawenudodeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=total+cholesterol+test+procedure+pdfPDF 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_off0000c3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D8 17636 bytes
SHA-256: 1aca28e9f4e8520a72bd8f88937c7ca01c4b0fba8c81a606499cc39a021c6eb4
font_01_sfnt_off0000f10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10E 10584 bytes
SHA-256: 6b9c92d005c71e211e42713ee6ff5d66b77b2785864b811e52653fb7ecbb2723
font_02_sfnt_off00010968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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