Malicious PDF — malware analysis report

Static analysis result for SHA-256 11800312ebf48739…

MALICIOUS

PDF

85.8 KB Created: 2021-09-20 04:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b3fac182c19b0d49c4562c04b7a302be SHA-1: 6bb376336f3ef8cf5c13434780c3b3837c0c6958 SHA-256: 11800312ebf487390f442c03c224abca54244db837ee082ff6f29c8c174a78a1
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing and trojan delivery mechanism. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Numerous URLs are present, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content or downloads. No scripts were extracted from this sample, but the overall structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=android+document+app PDF link annotation
    • https://altonika.pro/files/fck/file/nopojafulir.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210917051820_0e7nxf.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/rilekularojedajikewetavab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1b6b0debfb0ee26032e77c5153f144b1/35447826988.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/sevutenexikabip.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffd579341cdd0393405636ce480dec17/20269864529.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/talebodewudemefiz.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/ranerafemu.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/69485884864.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/toxadegifuxegodaza.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/47888421303.pdfIn PDF document text
    • http://zeci.nl/im/image/11744918735.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613566f027c0d---simawogenitares.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/71298186850.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/mixubilowitexez.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/bijelevixejoliseluf.pdfIn PDF document text
    • http://lowchens.org/userfiles/file/migusoj.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/19r3r2b1ohea03l1dlijp0t6i2/zixodorij.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc5e6dc1cb---venavujizibaxutefinodiso.pdfIn PDF document text
    • http://askort.pl/Upload/file/xamituxanaxavekenuduj.pdfIn PDF document text
    • http://sinostandards.net/upload/files/22121659859.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/81329893212.pdfIn PDF document text
    • 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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001050d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10540 bytes
SHA-256: 59d11b97155304ae33821f1a08955dc2b2233caef4c81735186be03e06cc20f4
font_02_sfnt_off00011d0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0A 17216 bytes
SHA-256: d92450cde410ce09db7d90e8521a04aeeebe202cae5ebad592e3c2a6c559e538

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