Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ae4873e0c3a48d7…

MALICIOUS

PDF

95.8 KB Created: 2021-08-15 10:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a28a0b91d9aa3216bea052e588f6585d SHA-1: e86f02d0bb69cddfb7f4a95194ff4c48eee6995e SHA-256: 6ae4873e0c3a48d7286dd34a040af7cac1a6fe094a267a249790313f129d8e41
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan distribution attempt. The file contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs strongly suggest an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://yuanyoujie.vip/userfiles/file/reforapirajamug.pdf In PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607778b490cdf---90231665569.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a208a470f---fegalogasoto.pdfIn PDF document text
    • http://abnicum.ru/files/file/pibavuwezetorige.pdfIn PDF document text
    • http://wghsclassof69reunion.com/clients/b/b3/b33699c65747f61a54cd06c2fab73d22/File/dabub.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/desirisax.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/62c02a5a84a771a6b7fa0645712c2947/zobiwukekunu.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/zojolovum.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/zafuwunukon.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/ske886jherg8s34c0hsu6doe6c/66163992927.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///zewufabexat.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/sogasezival.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/94367883419.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081395f91758---30968479163.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/84e225ba7a037068f1e802316be17f9d/mofawibapulobamumum.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16096cf20d909c---44089081160.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/badizotimurifakeroviji.pdfIn PDF document text
    • http://mstreatmentadvances.com/userfiles/files/mobigonu.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/38651494832.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/tegasugamitexixez.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/tejoxi.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df77fd6bee---62793442138.pdfIn PDF document text
    • http://dejede.com/userfiles/file/1403767316.pdfIn PDF document text
    • https://sieuthimayphat.com/ckfinder/userfiles/files/54012145982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=limiting+reagent+worksheet+answer+key+with+workPDF 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_off0001123b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123B 17760 bytes
SHA-256: 841ed8ea8aa6fe325e203456d4c938fba14f85567d0c699f545d395e2d638782
font_01_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001588c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1588C 10756 bytes
SHA-256: 6171bfc300d15bc463716372b745fdb9e92346cad37f2161103f2eb975ca816c

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