Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f786dc93d03e4d…

MALICIOUS

PDF

87.1 KB Created: 2021-09-04 16:33:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 019d6f569452692920dada8d41557e95 SHA-1: ae5e87cb75c52c6b4e9900d1df4e0a1fcaaacaf7 SHA-256: 67f786dc93d03e4d157ce21571e36846da49446b4a3824e35ebb6d84a2051250
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a3dc77035---lalibuvimoxiluwiv.pdf In PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/5e58686c95893116fd8af4ffe1b56850/pufujogekipiniburunitugit.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/jifabobik.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff75b50907---61739199200.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085073c482aa---tatotikipi.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e57733891d0---nanap.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e20de3b3dbb---legazuju.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc61daa0871---jusatinapotameg.pdfIn PDF document text
    • http://cocoal.com/uploads/file/54138077693.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/28869308538.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/94030105151.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/bezuvikotab.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/94268804087.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/zubegivabotabegefuzikedav.pdfIn PDF document text
    • https://ewt.cz/res/file/wemis.pdfIn PDF document text
    • http://rooptex.com/uploads/kazovebamuzezinapaz.pdfIn PDF document text
    • http://iccarrentals.com/files/file/vepexasazubog.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/muwezokapinim.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d587a2b74---temasulofisalowu.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/15092997962.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/sefufoguredinore.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/97112800092.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/eb4915011fda27e538dbc47ba22c8579/xasavamezusunufefidif.pdfIn PDF document text
    • http://shangrilayunnan.com/ckfinder/userfiles/files/80026254382.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/160b585b78e859---webox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=un+plan+de+vida+para+jovenes+libro+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/134033ab36682227e7e39447d6c25a6a/wotixuzelafekutivivisefis.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_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 19332 bytes
SHA-256: 580b693c4e29c45465a9c99cc619e5435cb80d6a133fc1fa85de09a0dc3bd790
font_01_sfnt_off00011d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D95 10736 bytes
SHA-256: 2a1c39126aeda56c4c7014b27d77d7b66e9ad6654503267f8913e6d919950ab2
font_02_sfnt_off0001360e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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