Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba6b6b7dea7d19e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-03 21:00:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 77c090f55874d10b13c6773950bd8c7b SHA-1: 1b762f97b9ad9445227c7f8fdc3588d86f386de6 SHA-256: 7ba6b6b7dea7d19e5310881ecbd077ad3d89b4eabfb0c1578828667d045ae9ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://philabc.ru/uplcv?utm_term=project+management+certification+books+pdf PDF link annotation
    • http://plafondchauffant.fr//img/user/file/15019781038.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/23699481416.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f2623a708---nofamowokugisenelarom.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210825110856.pdfIn PDF document text
    • http://metall-press.ru/files/3587505263.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/83c1d6136011dcc3757549e605987aa8/vanepepowa.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b9210a6a0---guvuzesudetijuguku.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161188e32e958c---domefozivozuga.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/duzovomadabategi.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/97160699073.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/mupojekamujixamowugopuwa.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/68281740674.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/lakivisuf.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/rasuzevagisodadamakum.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/sonijaji.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/072d3063c692f7820220c592eaf49800/jajosu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/1af560667938bf5f7adcd80dc19389c7/tijozi.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7a3ef313---firabojubujubaxexaduvexuk.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/75660113623.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611468c0e77c6---84175066244.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160759a1faf52e---34358087767.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/tadekedezarufe.pdfIn PDF document text
    • http://www.depomatrial.com/file/88782187382.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/riguposuratap.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_off0000ddbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D5 11280 bytes
SHA-256: d9e55205a812028fe662b6c40d7ea455a7d5409512b8b83a35085a5f3e8773ff
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 17196 bytes
SHA-256: e7cc53adfe4b1ae02ebd568351a781e7da856f374ce74a0142e2c3f271566985

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