Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2ac2d2eeb41a3dd…

MALICIOUS

PDF

80.9 KB Created: 2021-09-06 07:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6917dd6ea2593d42d937a2e1fa69ecb5 SHA-1: 50d2fa907612c7a24593b48f88327d5d95ebfcfe SHA-256: a2ac2d2eeb41a3dd5d9c7fcd7f413d01b615235bd452dd5c26abc77bd1008e0d
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and ClamAV detection as a phishing trojan. It contains embedded JavaScript and links to external URLs, some of which point to IP addresses or compromised WordPress sites, suggesting it is designed to download and execute a second-stage payload. The presence of a download button lure further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16079df1043a68---79991761702.pdf PDF link annotation
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/bilezulamapoki.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/nafesekixeduwuje.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/b793t9t8gvuffgol9ijhhr6jp7/62999781373.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a56e85706a6---kuguzidupawexixitepifaj.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d323ac1a9---gavasusubofapuxepuviwuw.pdfIn PDF document text
    • http://le383.com/uploads/files/80850831466.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b25f6982119---25614532332.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/bd0fa7713b96030b57b2fef481bd1c5d/16292253753.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e78a6895b62---baninaximodus.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/83460af08964ea69f0979f49d60fe31d/6213817545.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922027a6c37---pukuf.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/84843692273.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb628f0cea---vijisoledirunu.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/kutozavodenawuwojozafiled.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/folanazex.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/gexiseli.pdfIn PDF document text
    • https://rajaunited.com/contents//files/ripavoma.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d02ee5c5945---90454615212.pdfIn PDF document text
    • https://osakadentalcare.com/contents/files/36448660489.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835773c5c4d---roxuvono.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/pujanapegir.pdfIn PDF document text
    • https://poulinstrapscan.com/userfiles/file/51713378590.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/86506064632.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3eec3ddac2---19655648601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+heart+of+the+tree+workbook+answers+pdfPDF 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_off0000d95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 17044 bytes
SHA-256: ff1eca82abc39da31a2902e1c042f9409e0757a6c36436bf8dc70547f3529989
font_02_sfnt_off00011da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA5 10736 bytes
SHA-256: cc6e4ce69efbdd75beff906904cbb13c281b6832140c91d795d185d71fc9653f

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