Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5cb51ece3d32f9…

MALICIOUS

PDF

76.5 KB Created: 2021-11-13 09:11:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9e465665ee55bf4c7aeecf005c578b1 SHA-1: 5e20bdbc04f1cebd4982477c6c76942030faccb2 SHA-256: 2d5cb51ece3d32f97ad55b32b3acee6a3cd63e0b431a9cc6680a0943d7f26433
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and present these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=crm+mba+notes PDF link annotation
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/pnfiehq1a3pof0m02a9k9u7t8n/xewivisitav.pdfIn PDF document text
    • http://recrute.fr/files/files/17919115070.pdfIn PDF document text
    • https://ocw.tw/uploads/files/72555696021.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1617415307a978---81926738260.pdfIn PDF document text
    • http://chinahanaro.com/userfiles/file///fubewuzanu.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/kifabeperitirukizoz.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912140601.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/vofujopenixurikav.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/xezanazorapumafubotemekif.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/tetelufiba.pdfIn PDF document text
    • http://koala-al.com/d/files/kinoxa.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/95019191447.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1618a4b2d9b18c---72203885838.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9l4t289juohkerg774nmktq6ca/kopilerituzaj.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_08_02_17_12_2876.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16158bd8b1adc7---86117888861.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/26517730819.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/punewig.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/bubowekaledotixatara.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/joxovalutagekitewivirupo.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/bakezadumadureso.pdfIn PDF document text
    • https://atarentacarburdur.com/userfiles/file/4251212303.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b57707432---zosagop.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/zixaxugituxusojipogimar.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_off0000c7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E5 17632 bytes
SHA-256: 10c674040b9099294d09c36d290316815d10edbe3eeda5aeafd1a5606784c921
font_01_sfnt_off0000f5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DC 10304 bytes
SHA-256: 7affd18fd175dcb6881481204c6445c3a2152c8994e0ba6cbd1c0b6573105182
font_02_sfnt_off00010d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D21 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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