Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b776e0a9f09248f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-25 22:33:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e72b6a0d8c5fd723379918545322d9ef SHA-1: 43a56290b2c5c8825d85518fa715a1dda4c1e374 SHA-256: 8b776e0a9f09248fbd8714cdbd597114b9d69ad41f57d5c8e86a605e42b37018
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a link farm with UTM parameters indicates a phishing lure for software downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=download+mx+player+app PDF link annotation
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/tibodavisoliregisowo.pdfIn PDF document text
    • https://pakistanchristiancongress.pakistanchristianpost.com/userfiles/file/sakosan.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363481d2f84---49088623671.pdfIn PDF document text
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/somujesokel.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/pegadomuwojikivavevuf.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/dusuwa.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/namafokowemarixopu.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/tisuvuragobukiru.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/meniwiguvutura.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/98969135909.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/parafodikifivaxiwig.pdfIn PDF document text
    • https://fond.ru/userfiles/file/besopadolow.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/53006414603.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/70057927011.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/kigoziresosuzovilarax.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/ligadorosanaga.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16146b54e7248a---dimivu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/4708928066.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/dupinagazoz.pdfIn PDF document text
    • https://sledovani.gpshlidac.cz/www/userfiles/files/17284275454.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/pizigofim.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/xekasevojagevajilewoxupuj.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16147e01969295---63712144427.pdfIn PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210912_023034.pdfIn PDF document text
    • 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_off0000cabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABE 20216 bytes
SHA-256: 1e38dd5e8750dd60497ad295fc531aa134f276e2b884edf247e39c99b2e29536
font_01_sfnt_off0000ffda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDA 10496 bytes
SHA-256: 706b314527a5307406a08414d1fb685fceade1930785b335e4dfb5e93c903898
font_02_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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