Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfac0b0c0fb8cad…

MALICIOUS

PDF

74.3 KB Created: 2021-09-01 19:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42e9a60d2acb6ca964afd30a5e298740 SHA-1: 96c47f9ec5e00f95c4c43b88af0b856ba8a82aac SHA-256: 3bfac0b0c0fb8cade1decb9f4ff0aefee3d8f38571ffe2319fa8e60552327a55
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 0.9976

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://synerhu.ru/uplcv?utm_term=integrated+surgical+institute PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160824e4730982---59711829200.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/kmvnum2qb35nvljr0ahv2t3l83/99414313542.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/osvdsggb6t05p6glm9mbkhrna0/13823808522.pdfIn PDF document text
    • http://guitarenko.fr/img/files/lotunetapijuk.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/bujobiwajutizosot.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/696jtcsc1tlg141fn8s9041tib/2684570224.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/50980084050.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/lanagavitib.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/18876680783.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/72438983409.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/banexinijegadarumizizan.pdfIn PDF document text
    • https://atl-50.com/files/file/sewoxegoxukojudesifo.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35168ac4f7---dujufolokujoxago.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/t9hbtg22honccc60qc4voii6g0/rixewuz.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0beb8cf2595b9ac49dcb39ecfb7958ce/maribeserodunapow.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/81462373929.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/820d23838225d809b91fae54750588bc/70057390516.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/cbac0e6f061d4d0eb2ec67d8b0bd3088/lupotagonopuragifexoso.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2740df656---11491757893.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/lukixa.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0eaeafebe---26366504930.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/95697178599.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/94684034460.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_off0000bd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD33 10476 bytes
SHA-256: 8cd631de1ded3c1345e2c3b752a6c7f3a4c719508394b1a3da86ad1aae90ec9e
font_01_sfnt_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 18508 bytes
SHA-256: d9ad3ac631f215e3317a5830b671dbc15b8150011aaa6766c7e22032b93a6b6c
font_02_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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