Malicious PDF — malware analysis report

Static analysis result for SHA-256 8269177f49d68821…

MALICIOUS

PDF

85.3 KB Created: 2021-07-15 23:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0468ee5795e6b9ca4e80c095230b9439 SHA-1: e625debf7d484521d0cdfb25d041ff95adc8f46e SHA-256: 8269177f49d6882122c4eb0628b3700e64cf05431f5763cc1e029ec55fa9b1d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to obscure the true destination. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure, likely leveraging the 'retirement excel template' keyword for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/098766750b0d2b0eb339dbd9e0338f8f/93986032580.pdf In PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b745a7ba60c---86096600074.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/73476296890.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3508ce78f2---tebufotazuwavediriget.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/lusaloribezenaratufi.pdfIn PDF document text
    • http://biomisszio.hu/tmp/35170938582.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab1f6fb5407---depol.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab66b4b48de---vovun.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b990b34b4---59353575356.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160babe279b995---jevigedizow.pdfIn PDF document text
    • https://alutat.com/data/file/gitowimolivekatexofifitu.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/2599d31a25b160eed429896ce563e731/66656287460.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210701_5401A7AC2E9E4498.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/dibivagan.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/5579ja4pp7km4ofp6fc80pc2sr/79430891517.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/65405283849.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/93256437834.pdfIn PDF document text
    • http://staples1981.com/clients/b/ba/ba027a536d51c1d997ee76cae6dc9017/File/nefuf.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/48612dc7a6a69e2c072273feedb1a3a4/figevikojelixasu.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/povibuviluvobofetijuxonox.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/5ir3u45sq66sdcv83as9b8qhba/69909167612.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/tepisumaxopeluzujejaro.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/60703427501.pdfIn PDF document text
    • http://cosyromania.com/media/file/14556963955.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gozabazegekimul.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/nimevipodolaxotikajoja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=retirement+excel+templatePDF 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_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000104d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D8 16932 bytes
SHA-256: e2e5071fb21858b608d9bf476c3edec1ecedfaac40c6a6fe9356c0c88da8d7db
font_02_sfnt_off00013061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13061 10396 bytes
SHA-256: 0318928135f9238ff79de3d38ef670b0f33a9c1efd7ff621a9e5a20d87f972ff