Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c1a028f2adfe024…

MALICIOUS

PDF

71.3 KB Created: 2021-09-23 10:14:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb59230893be59fe4c7d25b688d2648a SHA-1: b2153309799ea7b03c0706035cce7d74a32733c9 SHA-256: 5c1a028f2adfe024fd6f3b5218c91306fbc9802db1c23d796bce8bd9ce4a3107
156 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 or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cablexconsulting.com/Upload/file/75014888033.pdf In PDF document text
    • http://le-bouquet.be/userfiles/files/lusoxofewelelugu.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/folisokoleniwuwobe.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021912336465000.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/32144775881.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16149b55bbd7b5---45204310187.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/16318247273.pdfIn PDF document text
    • http://hanauhrova.cz/files/7874219858.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/14053954182.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/70939657661381a5125d54.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/dojifu.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137d22cb556c---muviluxotus.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a092db9605---7457004382.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/87043421759.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/30673699403.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/65991194846.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210915_07F1C99408077974.pdfIn PDF document text
    • http://siamintertrade.com/file_media/file_image/file/65300753055.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/bamegumopufekamukifusow.pdfIn PDF document text
    • https://fu-ko-property-agency.com/webroot/editor-uploads/files/26577980414.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/34669822796.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/duvigosikizudunu.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/1965317007.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/nelawimobupozimif.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d19689a0f---xosebizunemononodudojoju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=demon+front+mame4droidPDF 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_off0000b51f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB51F 16612 bytes
SHA-256: 63c19ab74ff3dd1c928d39730e9e0dc463262f814b3aaaea1cf4430713706f75
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10380 bytes
SHA-256: 614060537a83263c99fafab46aa69c94b54778e927d10ef4c7c13eefea179700
font_02_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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