Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da36cc06196f198…

MALICIOUS

PDF

83.3 KB Created: 2021-09-19 05:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d917aba512eae6c8f259e52bd456c3f0 SHA-1: 5f36c47a8645bb803576b40fd00435a7cc47fa88 SHA-256: 3da36cc06196f19844e7be7ce73d6a4979b7bbf047928a044fe3b9a8daaffcf4
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification strongly indicate malicious intent, likely to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=dot+n+beat+apk PDF link annotation
    • http://sanfrancescovet.com/userfiles/files/89662148542.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e166179155---68357018377.pdfIn PDF document text
    • http://wx-bm.cn/upload/ckimg/files/202109132300574650.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/91633480890.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iig7i2h9vtf2a0rai84trtfic7/33673460022.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/mewoteb.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/ziduboforimaposomo.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/18590471449.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/31270574880.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jawedozotizonizi.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/biduvizaluruganed.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/8fdf2118de5374db1a39d47a9fa4c7d0/zetixijagav.pdfIn PDF document text
    • https://mlspoland.co/files/file/55418742920.pdfIn PDF document text
    • http://lor-rostov.su/userfiles/files/17935626271.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/zukisagevimugu.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/922736834598125c03d8b575a15ac14f/48421693524.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/mufivivasolomumugozuda.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/kekezobavefeduxofexu.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/nemewekolaludekapeg.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/34684562053.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/redugenogufupuxowuwe.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_off0000dcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 10072 bytes
SHA-256: 23d1bbaf3622b1b8d15bd5221b6993787fbbc039b797bfd00b1edb94b1ca258a
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 20152 bytes
SHA-256: cd4a05c3993757e713bd2d3e4b07b4e130e323770dd60cf5112b4582a35d799d
font_02_sfnt_off000127f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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