Malicious PDF — malware analysis report

Static analysis result for SHA-256 049b1e1c3da3334c…

MALICIOUS

PDF

89.4 KB Created: 2021-07-03 02:56:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 42545b244a65c1e7e976e9aa3c95c248 SHA-1: 48bd5d8cc6b76b6eb640791fc57619a5d6d728f4 SHA-256: 049b1e1c3da3334cacc3c7f5a67c46d0b2817e99ca36a64e38c5f74d4caf91f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, with some links leading to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://n95america.com/wp-content/plugins/super-forms/uploads/php/files/a8c7398496464e0b8469b33f199db896/57387854810.pdf In PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/lilijenesojotenipafo.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/05149f5a60c8081d1fff4dd3b2676429/37955196382.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/vodesilaguxukuvu.pdfIn PDF document text
    • http://greenbrier101.com/userimages/kubuxuwizonufemuwusegevu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/dkqea1iu58bsufgg9ibv2i5m7p/getupiwigulatoxipelopibup.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/gumabufinoxibe.pdfIn PDF document text
    • http://1-cx.com/ckfinder/userfiles/files/52128841591.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022822c9d0---wuvubexejokaxiw.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b235c2e8c3f---lawefadoban.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/25048569459.pdfIn PDF document text
    • https://menu2uplus.com/images/file/labuwiroz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873bdab26fc---93150698298.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/fokufexoriwuxeverotibu.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/zatutofokorujaziw.pdfIn PDF document text
    • http://glotecgh.com/upload/editor/file/domujesejosataka.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/an2inf92660nc58gmr5djk9uv1/6630656028.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/esntlketip4nvvprflecvgcpb5/62425847717.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/84475643892.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160da7f5fd399a---tizapuzajugofizinatajim.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e90b259fa---42216266743.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///winet.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/e3edb7692796be12c51a784e222400ed/78323968005.pdfIn PDF document text
    • http://:/ExceptionSubscriberService?wsdlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=itron+openway+meter+manualPDF 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_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 17584 bytes
SHA-256: 5185df5bda070d478a4b9d11ebbe330f6f7017b4e89f19b3f151c6d56980dbd9
font_01_sfnt_off0001277c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1277C 10404 bytes
SHA-256: e383527a05e089d2973a23244cceecdf92c0789514269fef9a904acfb2cfae21
font_02_sfnt_off00013f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1