Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ecf2f84a89993f4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 17:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: eccbf73ec65b11222b65d662bee24e50 SHA-1: 902279bd53454debd3dcbbf9fdfc5cf24a3d8890 SHA-256: 6ecf2f84a89993f4e4eccf74793a19edd5fff2e172a12a5939b40d0f6b34a721
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains or compromised WordPress sites. The presence of embedded JavaScript and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=dolphin+emulator+apk+pc PDF link annotation
    • http://brlairport.com/images/file/sovutojinuxezasobogobim.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf44b1bf6c---ketikotufadimepevavoje.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/58349630892.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nudikumowamubekatibufub.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1614372b278a42---48768187843.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/6113173393.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/21390941874.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/dafulikinig.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/nafobijozeramijerakowad.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/vibaxobukor.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/326fb125ca1783d6e0e4a5ce0c1e69dd/nomaledokitagitafowir.pdfIn PDF document text
    • https://alpinashop.bg/files/96683559518.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/fekilowiwapazilav.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/lijonikekoxetomiv.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/nomiforobilomawakoradax.pdfIn PDF document text
    • http://plncse.hu/php_data/file/nudobuzi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/30674adf3510b8fc9f5f6efeffab3ed5/tetemusitiborafik.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/67394361054.pdfIn PDF document text
    • https://nidi.mk/ckfinder/userfiles/files/14535505807.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373dac4c05c---fidulixojulu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/kefudesifusuxuvusumeramo.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/1b663f467215b797c31fce44fae0dcfe/kajatemamatipibulusove.pdfIn PDF document text
    • http://positiveforce.in/uploads/files/jumoxulotus.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210914_5E89CD3B1068F28B.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_off0000baae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2C5 10664 bytes
SHA-256: 8b3a4cb457dbdd0053811c9980c0f28199fc1b6dc7e6461408caf12ad30f1b59
font_02_sfnt_off0000eaf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF4 15864 bytes
SHA-256: c25e2da0d14ad091ca9af0e6aaaf91952fa74ba6c89e6e253db5971de8eeb687

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