Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9b98cda4384761…

MALICIOUS

PDF

90.5 KB Created: 2021-07-22 03:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 35cd2cf48531d9b6fc1aad977867fc44 SHA-1: a9e18f5e111482a427dfe2a4626849944bd0b0fa SHA-256: 3e9b98cda4384761b325a9771d0f05a80e23610d5004635c52fd913cb48410b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains a link farm with numerous URLs pointing to various domains, including compromised WordPress sites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the structure of the PDF point towards an exploitation attempt, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://vaitinhdien.com/app/webroot/upload/files/banarew.pdf In PDF document text
    • https://divinenine.net/userfiles/file/rizelakomabim.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/dafodujajetisu.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/xirezunofisuze.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba896b22dc---bumabo.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/xitewaxuvujodibu.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/redofigefupilutat.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e688e6621eb---sejevopuwipilopakevobulab.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/risiwobilezowubepi.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0f2c80cf8---55284713392.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/gifibekotipobapivevekodik.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sirodedesizovotavazoketi.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210626_337FD51EC18E9002.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a0090d58bb4---vibobixubomeru.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e81066f27ab---22564103434.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2rq3na2p670rsvlbf70s45n653/36507243487.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662f2e56df---596534342.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ddd129c25f6---3341528825.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078c00c9529e---kokudojakevegola.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607243da2fca8---7624171719.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32c1be08c4---fiwisositafovivesab.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/27240752631.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094af648f9a7---fejoxanukebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=what+are+your+goals+in+life+interview+answersPDF 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_off00010039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10039 16588 bytes
SHA-256: bbf0424f5db85cab10d34abff6bff5323f55f7ce7d5424be5a71dce3872fb6c6
font_01_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000142f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F0 10852 bytes
SHA-256: 1b8c39e20149be33666db882d97d8519fbb834f65ab339cb5cd39fc11d6a67fe

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