Malicious PDF — malware analysis report

Static analysis result for SHA-256 860c1cfcdcd6e8ec…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 00:44:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 14ac02b4e81e4de4d8fc2f60aa821a3f SHA-1: e789ae67ce53273a1fd8a70c044ba9906c550a5f SHA-256: 860c1cfcdcd6e8ec3e678290d4fe82e0473482cb9c9d7a8e5dcc1236157af4f4
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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=learn+r+programming+in+1+day+pdf PDF link annotation
    • http://whipitleather.com/userfiles/file/34285369565.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/lovirelododuba.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fodavekoz.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210917_110308.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/namejiruzebawini.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe58fe12c0---dedogujitedatofowinenu.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/15ee749ded7c21ceb5131081b55dceb7/lewapesemofejarebibutu.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613840f5a54f9---22038232642.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/tigimuloxuwijub.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/nojexirat.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/fidolurinoti.pdfIn PDF document text
    • https://phunhai.net/upload/files/49555907999.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210914_120643.pdfPDF link annotation
    • http://trust-law-firm.com/userfiles/file/20210902120047_1970994525.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/87309470484.pdfIn PDF document text
    • http://apsons.eu/files/file/nufeloti.pdfIn PDF document text
    • http://budka39.ru/files/71738919869.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///35898831591.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/sibuliri.pdfIn PDF document text
    • https://edarky.net/data/file/xevulodebugubi.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/xozabamidujiroviduluw.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/wugakasezule.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/wixukogegiligedimabutu.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/11363512143.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/63232706050.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/rorirudeged.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_off0000b424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB424 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3B 10652 bytes
SHA-256: 9a3b284b2b15ca365e0caf59ab427a09fd9f43166b7b29d0e1744da3f16213d2
font_02_sfnt_off0000e460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE460 15108 bytes
SHA-256: 86021bc59e7bc6220d9f4ce49b0ebefadebfdba6e81fcc2996be8272e9d023f7

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