Malicious PDF — malware analysis report

Static analysis result for SHA-256 9753251a30dd4588…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 22:05:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e10cc8e1f43b9d00194d2bb650088c75 SHA-1: e0d662ce1a20f5972b517914b1a09cc771eeaf88 SHA-256: 9753251a30dd458896db671b9aef99aa0d026180fc90a71e8f9bcdac17373e98
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links are likely designed to host or redirect to malicious content, such as further malware or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c059aaa2ce---82152399726.pdf In PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c62d53597---fajuzobesetaxabad.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/wazorajovovafojinibag.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/getixutidupewux.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/ruwunuronipamolima.pdfIn PDF document text
    • http://spprp.pl/userfiles/file/ranopama.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ta0bpmhev85b59hchq55lbo3fb/boputobalivamakovazevug.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kivipifazezidilofotokopeg.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/sfo6g4ksvmrhb85n1n7fh9udp2/61248451691.pdfIn PDF document text
    • http://kelsenator.com/userimages/jawopilevudogob.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/kajefibibokijigugepekena.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/99238074961.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/jikakopewatutudud.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/senilaxopexovo.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/16946134052.pdfIn PDF document text
    • https://tarsiman.ee/files/file/69746772856.pdfIn PDF document text
    • http://www.instalacionescueto.com/nueva/ckfinder/userfiles/files/33662414093.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57792196137.pdfIn PDF document text
    • http://darec.sk/files/files/86966702504.pdfIn PDF document text
    • https://onecre.com/images/content/files/nademibi.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/31709615141.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61368425b1e22.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/14199093034.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/jexiwojilugojegipowujen.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/47572456738.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd3850e84d---85114107514.pdfIn PDF document text
    • http://nirmalamathachurch.org/cms_uploads/image/file/boguwaxomawomam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=peach+live+vip+mod+apkPDF 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_off0000beb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CA 10468 bytes
SHA-256: 419e4276ee24d4fd2c3e7f0197f75711edc07534d733bf90a46da3484054b701
font_02_sfnt_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 18272 bytes
SHA-256: c6f465b449ecc21119a2f6c87edee8937c0514d587891577f2f3f0b26a50f778