Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bffa61ac8919566…

MALICIOUS

PDF

79.4 KB Created: 2021-09-04 03:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c6d37c452c195d0159db52a126271fdc SHA-1: 8f3cc4237f90fff9b184dfea4b7287e915a2dc49 SHA-256: 5bffa61ac89195664553340be6210a39f9d491af5f63e900d44a2e995cb1105b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links, many of which point to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8fb77f290---zewamipumalisuxeju.pdf In PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/kivuxuji.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/doritapig.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/fajiselefabufukuropefoxun.pdfIn PDF document text
    • https://mattress-leader.com/media/75571587771.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/db62f098db5d4322c01fe86e7e1e134d/83829656621.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838028e416e---49036945450.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/1632db3ca9bf7d85b765c8cbad92fd5b/72558680615.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/6421346183.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/758e9e43ebccae183e936a6e7efdee7b/bajeperekikufonaronipef.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/puxapuwativakizaxiwin.pdfIn PDF document text
    • http://imaginove.eu/data/Files/fogasatuvizemakosoxaxetus.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xetudafuregazimugi.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e515b0ea625---vumigenixuxokolekare.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/11202101094.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/3c16b0ca5414a5e8d6a8947aa5cec90c/6763301852.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/96727510683.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/befutotu.pdfIn PDF document text
    • https://yepsell.com/userfiles/files/17631843618.pdfIn PDF document text
    • http://chargers68-50th.com/clients/3/3d/3dd154274af4887fbe356f6dcfc18689/File/nirexilozeku.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/zuwifavafutewo.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/retipupunamigaxulavufede.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/vraibt613aifvlrd96moqccas8/xapadonomotido.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/ba2927a5cf362fcda11f8bb7c63f8f01/83673779862.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/45059458371.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=comma+worksheets+5th+grade+pdfPDF 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_off0000d21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD21B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2D 17060 bytes
SHA-256: cc154a014d6ed320366b9fc4dffd1f6f3ea02cedd9463984ef18cb9bd07bafc9
font_02_sfnt_off0001164b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1164B 11048 bytes
SHA-256: 8beb87b5ed3bd757db7cc21c2b54004ec0b5aa15c3ca109ae4259ab49f54941a

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