Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfad0d2fb5931b0f…

MALICIOUS

PDF

99.2 KB Created: 2021-09-02 18:26:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dfe7efa56b6d58585a9a7b6775935a1f SHA-1: 8d3e6fcac4d6afcec4ec77fc56807efaaa04a548 SHA-256: cfad0d2fb5931b0f82a116e553ae8f72e11c05aad5e14e672c477cb966aa73b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are associated with compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=phylogenomics+an+introduction+pdf PDF link annotation
    • https://dadesigning.com/daduserfiles/files/mebunisovurokavixa.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072009d102bf---90643000905.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/bu3hu8i052ti6ppr4ituu7lunf/kagujanidaxunoxewijimuv.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/mifima.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070d960072c3---liwubigudoverixazoded.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/gojazixazad.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889d46dcb---54104258931.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/mabolorojebivujud.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/dr9t1715fh9e3e5ukunkpnofph/50130636236.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861d021185c---timosezetawikafal.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/13139212519.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c98b30b9dc5---13833628273.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/mevaxunikexalojefiza.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/nuxufavo.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/pipefiligozobuwixeruwu.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/69937490513.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/jorabefegusalijefuba.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/64020480746.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/60715837750.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/510s6mfacitt43q2dd0e1nlmdo/gipatulek.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/miqjlvkla69bjnkv2e0n8ir3ls/15924146064.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/kh1crkn6i1s1226d2fj8fue2hk/tufomisobipegerawa.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_off000119c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000131d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D4 19152 bytes
SHA-256: 99fe1928015f7e5363d6ab4798226e4c23b8b1575829c9265214cfaf418f0e70
font_02_sfnt_off00016489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16489 11280 bytes
SHA-256: 7842fc6d7953c206754173cbccc1301c72a319642a4f725ba2960c7771a3e2fe

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