Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cc176b3a023b7aa…

MALICIOUS

PDF

76.8 KB Created: 2021-09-12 01:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 65ce2979f7de64c178bcea850d899b9f SHA-1: 5bd844581e30342be4fffb969f51ce50d9d64c8f SHA-256: 6cc176b3a023b7aaa886d257200efa71c069e3d26ffbf29769702ff51f018d56
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, 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 phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pistant.ru/uplcv?utm_term=best+voicemail+app+for+android PDF link annotation
    • https://mimpidia2.com/contents/files/17669971958.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/90591668913.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/dokovagufipigewawuga.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/80308644127.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e0cb7737---25329504484.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/87720346016.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/novotivubilogonovamux.pdfIn PDF document text
    • http://erpos.sk/data/files/73006336236.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/kenejunomitu.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/39989134844.pdfIn PDF document text
    • http://mybed.tw/uploads/files/202109102028072248.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/bejupofalerefebuz.pdfIn PDF document text
    • http://vertracapital.com/uploads/files/69331259240.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/xikadezejerapizerubixido.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/40411627791.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/50462226098.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/97684087026.pdfIn PDF document text
    • http://zzweien.com/d/files/vefigozojapulumofar.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xutizo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132c84149ea7---pakukikepefidovanawovoleb.pdfIn PDF document text
    • http://ducnhua.com/upload/files/jadizudipotasimoviraref.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1f2ae83bc---najovamo.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe8947f364---kubumu.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/wotan.pdfIn PDF document text
    • https://negaratoto.com/contents/files/nekasoponowawexuto.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/58750276908.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_off0000c8e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E3 10900 bytes
SHA-256: fe62bf19a44432d8994d7c4c81bf6cacabf7540f119a0e3a92c0c79a7cbac031
font_01_sfnt_off0000e228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 16628 bytes
SHA-256: b5d07a697c5334dbe045e3391951d917ff87f3b72445ad7260037fe448afcc15

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