Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf6a3b00ba5de91f…

MALICIOUS

PDF

86.2 KB Created: 2021-09-06 06:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68f37b7dfff44afe0dec5b13b4147e9b SHA-1: 70f66366cae133f8577aca5aac9923e8a3bf9dfd SHA-256: bf6a3b00ba5de91f6aab9526784a72ecb0be2b50fd0ea11d25234b824af4dd8f
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. Numerous heuristics indicate the PDF acts as a link farm, directing users to compromised WordPress upload storage and other disposable hosting domains. These links likely lead to phishing pages or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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 http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608896e9e4194---23308991338.pdf In PDF document text
    • http://tksvolga.ru/userfiles/file/zopig.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/nqv0l26lm6nphhbjgs78gmot34/29245413344.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/manuxemajisopibinozarate.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/69998254347.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jiganepumitevigipipaf.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/63761013988.pdfIn PDF document text
    • https://menu2uplus.com/images/file/2468287801.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/vrl5630tvlri7spo5hvgo8o9r6/simesowexavabipanevagoz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/b5f2d3397c7db3dd93799aaeab043d6e/18771961658.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/41824110197.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/68692075724.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/0c8efe5ccf1d34f6e71f2af5134f5325/wexekilubinegiwi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c320a23f508---27730346871.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/sozububamubifamodisefofud.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611af8584fbfa---11574118295.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/pimamilaziz.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/3793570472.pdfIn PDF document text
    • https://dunaweb.co/bg_image/files/21621097308.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/91811649058.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cff6217b0e---tewedawif.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/14635987597.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/22378598897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=bece+chief+examiners+report+2017+pdfPDF 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_off0000e7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D1 19504 bytes
SHA-256: 08a603b319f00cef0450c0f45930b43adbaf96548c276bdf50946c5885e963d2
font_01_sfnt_off0001181d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181D 11340 bytes
SHA-256: 0f4b0616c93f8427c5995a071b288d529be12e973ac59a36791a62dd7d947c68
font_02_sfnt_off000132c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1