Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76466d26aa5378a…

MALICIOUS

PDF

84.9 KB Created: 2021-08-30 09:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed5071ef01d9881e2d7fdcb6f85362c8 SHA-1: 74ab0281389f46eab416f26ec3eb2bcc669a2490 SHA-256: b76466d26aa5378aa418c28d7a0437dfa5534a0253f51b5bc141e43fc51c77f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Analysis reveals it functions as a link farm, with numerous embedded URLs pointing to external sites. Some of these URLs are hosted on compromised WordPress upload directories, indicating a potential distribution or hosting strategy for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://szentdorottyapatika.hu/files/83785502814.pdf In PDF document text
    • http://canxetaidientu.com/images/file/babamogenafasozo.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/rivoxubawa.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/dawimeg.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/oruou4eupn7l56ao1fs3dvfnu5/suxobikixedezigikajereda.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609048bf8a3c2---daxabefaduz.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/6d323cec45bc11106dcf85e48870cc4b/44835046974.pdfIn PDF document text
    • https://themalc.org/files/file/44351531390.pdfIn PDF document text
    • http://short-story.ru/upload/file/jepotizegijog.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/40824631661.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/xurerevijakifolaxujojijov.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bf4402fac---51391255306.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/45941562267.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c94c587fbd4---ropitisuravununa.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/sexusi.pdfIn PDF document text
    • http://mobitransjogja.com/files/tarofusetixikawosaniwuvan.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607875532529f---gebet.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f36911c22---pijasipoza.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/nepokexevarese.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/12324546412.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/25572479936.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/19165ce1c03a75a7ecaf0d03935801c0/78354705390.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/81197901268.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/bemapigudokijopakof.pdfIn PDF document text
    • http://klinok-saintp.ru/files/wotazasulusonabomapenore.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=particulate+inorganic+carbonPDF 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_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 18204 bytes
SHA-256: 1947d418765d7ff30e11bd98c87258037f19fec2e0f61f9a11f7df65486bc23d
font_01_sfnt_off000114ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FF 10476 bytes
SHA-256: 2f98fdeb6a090bcf7d75bf6f87271208805842081760d915939d23e269237efb
font_02_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1