Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b706957fdeff45c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-01 13:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a69f9330d0ae2499ffe8580fd5f3a650 SHA-1: dabcd82c3977428b7c1450acd895d69a7b46a841 SHA-256: 6b706957fdeff45c5d444a0171ed119ee725b29068273c12a13460ae9f4926f5
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities. The heuristics indicate the PDF acts as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage attack designed to obscure the ultimate malicious destination and potentially distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/52ef75fa8866c97316b046033e525119/43103493878.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a5dc3a978---95385979422.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/29252965566.pdfIn PDF document text
    • http://change-sexy.com/files/files/xarerupezit.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/domeretusakelax.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a166ecad8---70514357362.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e046f25b965---42224164507.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/mepukezowenumukaledi.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/54487835057.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608102ee51d7c---86980494688.pdfIn PDF document text
    • http://indyztyle.com/ckfinder/userfiles/files/rujarujumomat.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/pavemalivufaxuwoguva.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/37199457134.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/17c9b1a42282832e97a73c6c5e85e013/55032390395.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/bd71b5b09cd41fe91249c774f147f374/90885773557.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/sejibazunata.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608446b67dc51---rizebezuta.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/vijififofuropojatovoke.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/suboxuparatagi.pdfIn PDF document text
    • https://kawanmto.org/contents//files/76731733932.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/tunolilinelugodetifi.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/sojozirelarevefugorabugez.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/13a61d7216762b114c83cda79574109a/zajimero.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=nurse+and+patient+halloween+costumesPDF 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_off0000da52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA52 18456 bytes
SHA-256: dd5fe6d45e4bb86365c5a2ef9e5ce37ec108a96cf233c708923204e37e126109
font_01_sfnt_off00010aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAC 10940 bytes
SHA-256: d89ebe39b2deba8b987f7995f2155c59fa9683b54ba75f66c5c45b11b7cae331
font_02_sfnt_off000123e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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