Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cae6a6ce2ff34f7…

MALICIOUS

PDF

100.3 KB Created: 2021-09-18 14:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54367b3f5be38961698e9601d7046e9b SHA-1: 1ceb7e4b2387d28f63ef7e5f1a73817c8ce7e5c1 SHA-256: 3cae6a6ce2ff34f795b61e0a142412b2c27c5988d35fe403a780baa20b0211a5
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 https://huntic.ru/uplcv?utm_term=transparent+system+bar+android PDF link annotation
    • https://nothingbutsafetyglasses.com/userfiles/file/95724889545.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/rizoputilen.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400df60f07a---jotariwesadikamupelosopu.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/87256765161.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/makavadaxoloxibesevazi.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143e16c4f272---51727338024.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ng1d03tnih9ecjffs8n2nvppib/borozaxupamalukun.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/tegupiteg.pdfIn PDF document text
    • https://kimcert.org/E/file/3628389058.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/ziwiwojixepikivesufoz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac51cd18ad---malulonareraxopipiru.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135799248f54---bodasatow.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/gulaludezoxovatefol.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/78183217897.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423b3c0ba9a---82535498553.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qkc8eg2tk94be8sea8e3799sut/3889828289.pdfIn PDF document text
    • https://euchebnici.com/img/file/79884222328.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/68211133777.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dusiridugurazilaxek.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/f85f7ecfca081a046c3068277781068d/81327711599.pdfIn PDF document text
    • http://hbaoge.com/upload/files/47485996974.pdfIn PDF document text
    • https://wwa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/3643354182.pdfIn PDF document text
    • http://classtool.info/upload/files/17173217908.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/lesir.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_off0001226e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226E 18756 bytes
SHA-256: 4f5847399fce045da4a2a6ff3880430651da6de137cd0702304b052231c9ddf5
font_01_sfnt_off00015391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BA8 10724 bytes
SHA-256: 1a00c47a3c39e037f2faf87cbdd1f777a38790bbd3c32a46805c1415537026de

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