Malicious PDF — malware analysis report

Static analysis result for SHA-256 42acc7412d5143f4…

MALICIOUS

PDF

80.2 KB Created: 2021-09-18 02:36:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdf0568f177ea295d2bc8d37c0d02ebb SHA-1: eb8a4d107ba4d2fa7e7094a701e0968511dc156e SHA-256: 42acc7412d5143f498de213728329b596eab70155cd9425384d065685cbeedb1
164 Risk Score

Malware Insights

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

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The heuristics reveal a link farm hosted on compromised WordPress sites, with multiple URLs pointing to PDF files, suggesting an attempt to trick users into downloading further malicious content. The presence of a 'download button' lure reinforces this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://wastran.ru/uplcv?utm_term=ocean+is+home+survival+island+mod+apk PDF link annotation
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fa9b15785---57014215215.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0b4da9b796a19e33f93635549c50cee2/redugemiw.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/87308559566.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/nunifulibewerufurosaderog.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109131323441374.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca0e25150---dudoxonamotowurokufusuwe.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1614192e4a0350---labifejefuvepibi.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/85333466002.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138492ac5560---32541217500.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/bolinifa.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/mudumigamovixob.pdfIn PDF document text
    • http://yuha.be/_files/file/54413687462.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/zenomibig.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/soguduwokiso.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///pogorutafalalogilefudano.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/loregasobiberuwak.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/55296052081.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/gizis.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/jefodo.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/43894322981.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/tasubiwelarevaneboje.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1b42d2a3---17759102913.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/lifuvedusatutukapu.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/33474400555.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130f61d9952c---7842507912.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_off0000cb57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB57 10964 bytes
SHA-256: f14c1375667d8cbdaf8f0376721b8f7c8994d5ebc0606b7c62c073a94df9055b
font_01_sfnt_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 20980 bytes
SHA-256: 3340c168aaadfb4df2d637876f232460e9c0ccbc85ae29ca3f93760fccbdcca4

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