Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed1ad70e6e510e8…

MALICIOUS

PDF

85.7 KB Created: 2021-06-27 15:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4419e2259a92bdfca53c134b558abd4b SHA-1: d70ca111e3ec6b6ae5343cca7555e4430211eec0 SHA-256: fed1ad70e6e510e8ad339eccc36135c9e3f767ad0c2f4dab61083f3bfc91a8d5
156 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://atonoserver.com/userfiles/file/2838230025.pdf
    • http://bilmatbasim.com/userfiles/file/73762019209.pdf
    • http://alexhofford.com/temp/files/file/wupenug.pdf
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/e1c17f2dd40c9dfcb8292c41a61cf7d1/wigojusigagumivanupufiv.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bkv9h9e0mjhtr8ku8f107qr2e6/nirozetoginiputijix.pdf
    • http://sushi-belovo.ru/files/sutumoruwonumajuvubaf.pdf
    • http://gernano.eu/gfx/userfiles/files/7096419913.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5799166568bc387527c5235219fab9e3/tavogiwazatupivomamupeteb.pdf
    • http://kingalbertltd.com/uploadedfiles/file/42572665266.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb2389c600---lavejop.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/36d7ea239648949ebc362dfa265ae59e/tiwutukavawudukiromo.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/15a7kiake09r7e3sgbp4glsb53/59280063470.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c63698c8c3d---46041090123.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608718e9104c0---jesaxezoxesakezojotot.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092c3cd43621---80466547676.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c309341f090---baloguwesakexa.pdf
    • https://mabuksusu.com/contents//files/bekegirudijesapabo.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3f0418bed---38616485352.pdf
    • http://daycamhoa.net/upload/UploadFiles/files/88488483973.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46df80e692---81128605426.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/96660329682.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/q92vnj4l1qom4pm4ll01hd4hu0/47951189102.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3caca28b---jebuduvidubirufolute.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/0e55b0b782a63554524332bd3d3f5fc0/pubewijagosifeve.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0ed22a025---wokax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=history+of+zero+in+maths
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecec.bin
375e3e7a280474b4fc11bc0a5494f5e5c8a6aacdb7d03276656d46a9be01dee7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECEC 17140 bytes
font_01_sfnt_off000119b6.bin
7e803a7c54f023e796a07bd68491a362fd022d2ff73ea3edf80c172fd95fad9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119B6 10600 bytes
font_02_sfnt_off000131ca.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131CA 16792 bytes

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