Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa537f3935617778…

MALICIOUS

PDF

69.5 KB Created: 2021-09-07 07:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 55388553a596b219a8d195c60184b6bd SHA-1: d521702dabdafc829685e91ce1de72c5573ca786 SHA-256: aa537f3935617778b0c5b8dee85d24f7c33616bfc858db2bbdd8e02761ba7d12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised or disposable domains, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://shellserva.nl/docs/Image/file/davog.pdf In PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075caa0c70c8---73113356765.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/lutolexitosepekak.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/89253064979.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/jikov.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/277f227288a9f4241078848d22aa880f/63207670551.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/c969c046f8cb72b5bc73a337fac75dbd/novitoduxe.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/cddc41ce9711941307380b43a0e657f1/30280366321.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e16b911b52---zifobo.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f4752a6b---sarabukodigofate.pdfIn PDF document text
    • http://ndt-ultratech.com/files/82120207185.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117dbeeeb57a---bopizuso.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd9bd6413a---42303715068.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/11919567964.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/seniruxawezabovusurizeka.pdfIn PDF document text
    • https://hometutorsdelhi.com/userfiles/files/babazutofefukovawafepuf.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/14454792343.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/72606868162.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/baronibulunevubemisezozev.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/jb362cn2ak5b78fihtjnh93hko/futabinigadutibuj.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/8d76b69250bca0738a6e38019a9afe4a/podefumuxotu.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51166248472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mergers+acquisitions+and+corporate+restructurings+6th+edition+pdf+freePDF 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_off0000b1a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A0 14464 bytes
SHA-256: d010f3a878036836f0c4f3f6083fee25f6aedde00f0d109bdd43210479672252
font_01_sfnt_off0000d5b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B2 11260 bytes
SHA-256: e2d2c0bfae0b2d5bb5ed4b40e6be1f71b6862f62d1392525bb75fe0221aece06
font_02_sfnt_off0000ef8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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