Malicious PDF — malware analysis report

Static analysis result for SHA-256 cec8ade721c6647b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-20 10:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1700cf248f9162abcb70319ab6279b8c SHA-1: 7767711670accd9039ed9a0c9298baf587d36c80 SHA-256: cec8ade721c6647b6af38655636b4bb6268da44ad4287f4bcf2d4a1000134cd2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=cricket+game+apk+download+2019 PDF link annotation
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/8ac738dc18e990930d2509341563dc8b/38539956470.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/gikodabogovinevus.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/78406667207.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/4175084168.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/74414111290.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/17319156449.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/kekuxeburalaboboruzig.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/26876308669.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/63887366139.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/92b9cb5fce5a831645ebf0f6492ac64f/60262561182.pdfIn PDF document text
    • http://home-plast.ru/foto/files/tafowatep.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/dudonobazutolenaxatoke.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/15064068751.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/55559506694.pdfIn PDF document text
    • http://bulmarconsult.com/files/sopizokexurujizavukoxotiw.pdfIn PDF document text
    • https://corianderedmonton.com/ckfinder/userfiles/files/25161069292.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/revoxegazibarameligujewam.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/20036905222.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614483be1544a---57137866175.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/e911hqet5s7kb89ntv2mld57ef/79309521547.pdfIn PDF document text
    • https://www.aukuras.org/ckfinder/userfiles/files/lavuze.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/09271b828d4bb737363a4cb0452a3603/75996543165.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_off0000c879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 11360 bytes
SHA-256: f87b6b746b10582d1523563670e5d08b02e8bef94d7449817a6f964b170539c9
font_01_sfnt_off0000e328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 17664 bytes
SHA-256: 52953f3cf6bc2c604b360c4e8a1dfa87ffb8ea9ad8b89ab91e102691e87bef31

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