Malicious PDF — malware analysis report

Static analysis result for SHA-256 cece2bcda51c8f23…

MALICIOUS

PDF

103.9 KB Created: 2021-08-20 04:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6c94313ee6fae2c41633b5f55ce7dfa2 SHA-1: 6a35deb62835d4fd7d9f3588c36cab80e2d7ca38 SHA-256: cece2bcda51c8f232fbf8b03ce750aacd6556bf9843eef3376386e0e9e4ed1b6
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are associated with compromised CMS uploads or disposable hosting. The primary purpose appears to be directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://partnercable.hu/files/5258820898.pdf In PDF document text
    • https://www.carrentchiengmai.com/files/60355846144.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/vazinonikepaxatozewuseg.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e564dafbb---68967014557.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1951b56d8---fipawupez.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c57d490905d---tagusi.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/30999282177.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/kegudisakona.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/16735703126.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/4c2eovtngibjcsa71t7m4tqb03/vilamufu.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5b5e50b94---buwol.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/gifuwesoramozeguramor.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/vr4r69rvr5oohdgkba6nnh15sr/38000213467.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/73828909944.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/37272337273.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/59966361885.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07a24e4912---nawesavitexe.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094391915e54---64443304150.pdfIn PDF document text
    • http://vhktn.at/images/content/files/fipopugagis.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8f01940ff3dfff27fd52e8801fffb1df/78142398692.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081fae6a7658---16557985971.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/24500136368.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/latofazowowefujibuvavi.pdfIn PDF document text
    • http://vodnik48.ru/content/file/xajap.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/bosodixewuribemofa.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//jipusomaterezoxup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+to+get+a+coroner%27s+report+in+ontarioPDF 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_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 19784 bytes
SHA-256: 50b274c62fa1bde95f792fa422617ed4cea751b91fa310d4ede72535768faaef
font_01_sfnt_off000160fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160FD 10616 bytes
SHA-256: d288bc19118de9b15c9d056657f6f9166e4dad45a2816147c71de970a2bcb0c3
font_02_sfnt_off0001797c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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