Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffe76fb09cd788fb…

MALICIOUS

PDF

77.6 KB Created: 2021-08-28 14:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 398bf493dde6a9511840b90e0e9efc94 SHA-1: 3dd9dedf28d890d66218e29939878da33916a196 SHA-256: ffe76fb09cd788fbd411891082373e101f05c85f5158aafb293634b8e9ce130e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with exploitation or redirection to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://componentcnc.hu/uploads/ckfinder/userfiles/files/muxibusutavuvopo.pdf In PDF document text
    • http://cuuhoatudong.com/upload/files/93637750491.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608b21099eccb---87135685364.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/161008658dac61---texutasun.pdfIn PDF document text
    • http://tcsm62.org/uploads/news/file/meninevonanurifaga.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/tejeve.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c68e4d7c3---zujapoviwe.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/12104878436.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e98a6007---voborejibuxun.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-24/20210524165547711053.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091eb5b14921---nalekarutesebe.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/faruwokinewatifani.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/revesubu.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/f55a7200da9dc420cc042926feecb398/853447347.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/wigidoxazubuteg.pdfIn PDF document text
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/75918362875.pdfIn PDF document text
    • http://mosjob.ru/images/file/43291535564.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/9abade6a837e6bdfb9419d52e36a43e9/diluxitabupijotabe.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210507205630.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/xitipiwedi.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/nuwox.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/22378381876.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=meaning+of+fine+adjustment+in+microscopePDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/cbba352aa80df603967258973d8557c9/26233617916.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_off0000caf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF5 17164 bytes
SHA-256: 80290d84d01d558cd3fe8b76a06ceb33dd6227dec2fd2625efcc49b9b7077cff
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 11140 bytes
SHA-256: 154bb59b9206196e7ff94b46186a78dd7727dff0ce841454f5d2ef0f6468e5bb

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