Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a77709a892662d1…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 04:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0babb44b6f883106ae3dafc6101e915a SHA-1: a396589419e594e89467d2c00c1d66fd11c97081 SHA-256: 9a77709a892662d1539839cb54696f96ec6d55fc9d828e32ca900293e598f7d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous compromised websites and disposable hosting, likely for phishing or malware distribution. The presence of external URIs and links to compromised CMS uploads suggests an attempt to leverage these resources for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=finding+the+area+of+polygons+using+the+coordinate+plane+worksheet PDF link annotation
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3aeb01fa98---31030458440.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/sawagosutemosajixime.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/56485835743.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/43505087622.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/16016757440.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f40400eeb---tosiletusozabavimuji.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/71705605697.pdfIn PDF document text
    • http://planbmedia.hufiles/pozasitujorixozu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/46857c36ce205f4e56b6974eddf787ac/bodonelakezibasu.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/819a164c03aa089aaf57710937084f77/lotaf.pdfIn PDF document text
    • https://nguoixunghekiev.vn/userfiles/file/66757471083.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e5461eca7be---21874837976.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/lowewom.pdfIn PDF document text
    • https://kaptenhoki.net/contents/files/41134058768.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/74910340536.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/6ea9be545ccefb1c9c3d8f801bc623eb/ruzadobejonax.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/selufovixu.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609eb762d3ed4---84886334214.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/naxitaludewur.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/192d74bcbb33112b1d565995aec90c57/42891943702.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/28244545485.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/molil.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/9821433686.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2a45cf94---67934657938.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_off0000dc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC99 11268 bytes
SHA-256: 0f50b19abc76451785973c5303963132a53f565f29a8c8bd4224fc839cdff166
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 18848 bytes
SHA-256: feb5988260b1abfd7f98fb2541808daadff89eb6f3cf0fa3819749d33c3d2b91

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