Malicious PDF — malware analysis report

Static analysis result for SHA-256 c91db30104c1ab35…

MALICIOUS

PDF

92.9 KB Created: 2021-07-26 13:41:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 764bbe34649224cfd4eea25c1cded30d SHA-1: 78a804b101f74bf77698d6186e05a592d55f3ebb SHA-256: c91db30104c1ab353fb077990d0f640be926a9ba7fd4a4156c5f7622d9fd58c8
156 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains numerous links pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or facilitate phishing. The presence of these links and the overall structure strongly suggest an attempt to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6634

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://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094f487d445c---gesagop.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b63d731508f---viwotas.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbd7178b44---suwepi.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cca8b5742a---sopowisubajukanalewulobak.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31594950344.pdfIn PDF document text
    • http://smithmaloney.com/clients/3/32/32eae1a42220421eddab78da2f55685d/File/kaxugugozuvapedokosal.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608996e107435---takukudid.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/jodixatalufo.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/c76d3e8dd029b3672be27f48293f1679/patiw.pdfIn PDF document text
    • http://energy-labels.com/userfiles/file/65016656081.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609841cc4d7eb---pivug.pdfIn PDF document text
    • http://keralajesuits.org/userfiles/file/rovufegojokusefawa.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/jetaziwovakixisurir.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/35794328966.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/23635758482.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f4a60fdf7---88286665665.pdfIn PDF document text
    • http://2440027.ru/upload/file/94781014186.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/pononapakomofukuv.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/95464cc970425c5b021a52e461a457bc/81302454822.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/toborimot.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aac81d8a388---lasijujezemevotige.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba129b62335---belikalemefuzisexid.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/a81ff0a77183b7a7d0f3eda9adfd1a88/bodifod.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077fb0796237---ratogujazinuvabojitupoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=analisis+estructural+hibbeler+8va+edicion+pdfPDF link annotation
    • 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_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12406 18816 bytes
SHA-256: 4605894e64a7d88b47d6985a70d29991c884a1c87c8e23574259489f487575b4
font_02_sfnt_off00015413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15413 11212 bytes
SHA-256: 0f99709ec6dbc65514346951a9885ed05a963e97bce23851f9d1fa0e050594eb

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