Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbcfb3e94b24aae4…

MALICIOUS

PDF

88.3 KB Created: 2021-08-09 00:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 46663e73f9eefed8762e0a09128c2814 SHA-1: e1c03f9811172418369f05cd6430c0813ee6b0fd SHA-256: dbcfb3e94b24aae447e071a56bfec7fb7cfe5fdf16e97a5ab5e8b93fc9e27e3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm or phishing lure. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to direct users to potentially harmful external sites. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c1bd309d---58363312343.pdf In PDF document text
    • http://feynburg-uhren.de/uploads/gakekanab.pdfIn PDF document text
    • http://rurisnet.org/images/file/15117203854.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/bagixofufikawezujire.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/kalekivexemasono.pdfIn PDF document text
    • https://ijpdua.com/contents//files/bogoroguredal.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/80491874919.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/27244773544.pdfIn PDF document text
    • http://palami.by/images/file/249685002.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c252cb83cc---85410221781.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ff6bf0024bcc0edbfe223f545e24ee1e/xunatimowakuzamu.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tesajogafofosovibikozaz.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/21448755287.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e9bd881d17ab6cd5c1d3aca40aa2beaa/bexaso.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/95241974239.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076e12d8a719---14567600768.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160722bb5f3c9e---88009200052.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/3ba55eccc85cbe8e441f03aa912213c7/palalimamix.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01c6178a41---jogatabanezobexapu.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/lufafagabanifusizova.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/gq1fkiif2ovoeh55c3gsaqgf32/jifofonefolev.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/mazezijubixuporaxivika.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/giwijatikukivomufup.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q46c2e1juo12apltd3jq778c0q/36405213571.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/21438105699.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/dugawakezigal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=test+tube+in+chemistry+labPDF link annotation
    • 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_off0000f592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 10692 bytes
SHA-256: 7dd1a8cda69bf4968a948c76af7a043e36a2a5232bf2ac2282006e1b6a1db345
font_02_sfnt_off000125ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FF 17280 bytes
SHA-256: f8fa3eb28439dd68c44a7d244a6cde2dddfb07cd3bcddf0ff719e8976925aa8b

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