Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4c8de6e3532f6f6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 10:31:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 03677b92ae54b323aff0fa6279636be4 SHA-1: b9958f26bc6662116e9e9b3d3a8f8cd591d40feb SHA-256: f4c8de6e3532f6f69ebc0f7841ffbe920be6a4cd13fe839801a04ea8a7a739dd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coonvalleycc.com/userfiles/file/pudinelurofa.pdf In PDF document text
    • http://fitviewer.de/files/file/dadajemi.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/59682958344.pdfIn PDF document text
    • http://hongdacable.com/d/files/79842973306.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/61136406213.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630824624_1.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f73063b90f---xefuzirewazafitadixu.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b1dfacaac48c459a657697c0a78f7b1e/suketunigodup.pdfIn PDF document text
    • http://jinyezi.cn/upload/gisonamarolomuguro.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/gowivupiraji.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/56096973949.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/losazirudesax.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/52817133009.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/tinarisogujemupisoki.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/felisisu.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614463f1dbd1f---8453617156.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/29958977731.pdfIn PDF document text
    • https://dolupin.com/calisma2/files/uploads/nodotova.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/nidavunimixebobol.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/96224965174.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/wipifegabatelapogenubeji.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/83412053241.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/12592512863.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/rizizutomege.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/jiwutelebutef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=naruto+ultimate+ninja+storm+3+mod+apkPDF 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_off0000ce0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0D 18540 bytes
SHA-256: 7e0750c7875fa7d32ff7da34fc761aba6f52153f06b344c8a998164c4cd30c9e
font_01_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 11024 bytes
SHA-256: 289cfbd8fb1ceff01e261430656849bc1fa9bcad45ce26e7513d36a3180c50b3
font_02_sfnt_off000117eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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