Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce87d2ae3205d37…

MALICIOUS

PDF

83.0 KB Created: 2021-09-01 06:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50c10d5e04d0bb582093e3afacc7796c SHA-1: b0ca0fb9787b8275099fd43d8cc76a2632c05d23 SHA-256: cce87d2ae3205d37fd38579681c22677bf9d30e842e65f900a6988d6d8a6b3e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate that the PDF hosts a link farm pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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.
  • 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://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da354c8e8---70120201646.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/38da946fb5e21ee51416480b45fd3428/84184833966.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/selekawup.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/zizegekezebepowebiwovaf.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fbd35ddfd---wijisuzolijususuwafewuga.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/m44c22ruqkjshegedk0hq5hmj9/gawanufutor.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/28873303654.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/45236095674.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f2ae2b68---34976445097.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6c8e387069---rojizivazafozumok.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e02083ec14---nabudawusa.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/r2oi33ggn9hm717a6l9o196hq0/wanakifegil.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/anl4bqpiedh76s25ngf8ljeapu/54992602169.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/meritabiwevokoro.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/gekogorirajidaduvutefa.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/54912928150.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/leramuvuzaremumanuxono.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/76541927788.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160829fa1c19d3---57797265874.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/8317076868.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b3b6867da580723ff0ec60ea103073f2/danilimudasatu.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/wosirijekufusidugorejon.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0dc66b06e4---rurukobemobazotola.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/37816109137.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+add+a+second+monitor+to+your+laptopPDF link annotation
    • 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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 10964 bytes
SHA-256: 02fbc05a5c5f6c154202ece31465e9229273fb37441356426a4c4e76050eee2c
font_02_sfnt_off00010f9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9A 18064 bytes
SHA-256: 087cddee6afec821cf108e398091e7d579b1e11bf88088648081c3a3446d430a

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