Malicious PDF — malware analysis report

Static analysis result for SHA-256 f829e8ecd9f31bd9…

MALICIOUS

PDF

82.4 KB Created: 2021-09-21 15:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 177bbd60408c0b4325e2be877f0542ef SHA-1: 7abc7b6f199467e837dcd30a8fdb3a65e7998c8d SHA-256: f829e8ecd9f31bd9a92abf7e535bb5162b05446da0ab16d7f5aaa6036b92c4e8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lightofislamonair.org/uploads/files/puseburamejowuvofa.pdf In PDF document text
    • http://rabotatver.ru/userfiles/admin/23194952735.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/wivizujawerakurev.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/rokexet.pdfIn PDF document text
    • http://asja.ua/userfiles/file/41953390157.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/sanunu.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/1209077197.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614855726ea17---neluzakufogetaxafim.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/87920932462.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/22968530731.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/siped.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143835fdfd75---24886716359.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/46991723237.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/54419497266.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021913029468398.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/79349639716.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/52510098560.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tiloro.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/woxulazovonetivegogejegu.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/83568570168.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109152057305207.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d17a3a2905---60097607664.pdfIn PDF document text
    • https://krusomying.com/data/file/zubanavizozazojo.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/64427170345.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+dual+boot+android+and+windows+10PDF 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_off0000dc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC13 10600 bytes
SHA-256: fc5459db3c0cb765a573eb6b4befe4e00af73f05ee3cef9a13d6c43cd80c6627
font_01_sfnt_off0000f461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF461 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C73 18212 bytes
SHA-256: 7c69f31954dcacf171089591d304b7f7ef51b7f0c296780143e670f0c9f3f965