Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcae779558892c59…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 13:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 024a37ab08a876a4b967a7473ee4a4d5 SHA-1: f6cf9f87f6085772e2e0e054270aed9a5720713f SHA-256: fcae779558892c59c67228112c34fa241168c2a88196bb2e252ef8fa20dab16d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and link farm indicators points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://krisoc.ru/uplcv?utm_term=libri+italiano+per+stranieri+pdf+gratis PDF link annotation
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/27255463c35f6ffb1c7a7015937f7bde/35117358306.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/fekeburatixe.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae50c780c61---gofefedonumesusumusugor.pdfIn PDF document text
    • http://ray-king67reunion.com/clients/41562/File/94655924254.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/rrk53s31e4jnmhokjbigd7vo1o/vesaletapadinikaj.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/01f1ce133ec669265eb4ba9c85c3e570/33726651858.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/tabirewinibelaminibote.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/17122866449.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/tkv82up7trn2uiq7oo6fekut1o/talatidider.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/31042702584.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/31q82u184rsv569f1beumceksb/kebes.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/98010277155.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/nabajabudap.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/bodobugawevuvik.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7f0e33c9---56385134674.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a2377aa3172---8403213462.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608728680b828---92055875308.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/lemugafakizudu.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/cf812a342a8a2b72a41667b549d7f822/65380095831.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0f2f17036fa7af44a2b06827eeea36c0/38930308756.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/kevupinokedalinunen.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/88633491155.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_off0000d7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C7 10768 bytes
SHA-256: 60a93c5606501b06e8d1c6bfb3b67d058d651a17cffda19ce8b06364bfd53a34
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 17872 bytes
SHA-256: 36a76b7ba9dae963e1dbbb81e579ec6904f26b161df7923aa2243de7c0650e5d
font_02_sfnt_off00011f35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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