Malicious PDF — malware analysis report

Static analysis result for SHA-256 337be7104b6ca462…

MALICIOUS

PDF

100.4 KB Created: 2021-10-06 20:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a952ca73e422d1666e83dbe7d685cfc9 SHA-1: 5f0c53265786161aef3fe7e3f2c3f71a7fb973b7 SHA-256: 337be7104b6ca46297a1147628e4c20217a32052310c57f5621058859c6aeedb
164 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to PDF files hosted on compromised or disposable domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for hosting malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://sirmamedia.com/ckfinder/userfiles/files/ruxidedobavawiwot.pdf In PDF document text
    • http://technocom.pl/editor/file/nexisizubopoletalezut.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/nasovivifuvibemij.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/d3c5fe21d5de77285c1ce6dd85dbeb92/33377008844.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/filifuxamekonugex.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/xotiwe.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612fffa41e29a---kubasefe.pdfIn PDF document text
    • http://full814.com/upload/files/gutifarag.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/zetabesibezexav.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/20743410881.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/78637019041.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/45849253906.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/3913308650.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/90670909688.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/sefozu.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/kamipux.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/jugurigerekobilukare.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/ximusogaforafas.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/bijep.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/0f2351e339154aa49f2582f5b832c647/putigevujerokesobufoxuve.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/basanowiv.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/zozed.pdfIn PDF document text
    • https://orangerun.re/photo/files/rujubuv.pdfIn PDF document text
    • http://zjnep.com/ckeditor/ckfinder/userfiles/files/49152698728.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/59065283104.pdfIn PDF document text
    • http://special-pharma.com/upload/files/xenegiluwib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=about+self+pollinationPDF 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_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 10472 bytes
SHA-256: 155b37ddede95a9ddc60f691f93b2d3077957d5693b5e4cf4580889c82cc842b
font_01_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 19936 bytes
SHA-256: dd7b91d82621c93bc331517147327bae88c79bb680774dcebebb8b215f65459a
font_02_sfnt_off00016bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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