Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8da6f172736c20…

MALICIOUS

PDF

73.4 KB Created: 2021-09-23 16:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: be67dd7c6099e8493548865f82695f22 SHA-1: 51cd892db5df92f9190ec35a3e9c49d6c8448057 SHA-256: 9e8da6f172736c206c3cdb1d9e625cfa772c4db75964354a9c53ec71bcc24150
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detection confirms it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious.

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://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449c450a2be---72885930812.pdf In PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc432b6415---nalazopugurarago.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/bijatavuzifenab.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/bapumefekosakuvonaxutid.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/muxaxuguzajoxurebizovale.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/137b5f4ab891c7fb14f2d9071c80fbe8/zobupanul.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/63114851150.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/33864608567.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-21/20210921045340908385.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/53011953269.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/42809074267.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/11770963887.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161343716a98e4---pemadifubawisam.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/55530607578.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/fb3dcf536f7d72933cac38e393f98241/pifepurumanawatovuwojugik.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/86825898752.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/vuvebovoxoweboxugijavi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/28885021727.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/2698399258.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/14434750500.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210903194656_132233824.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/zaruluduzagadusewete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=which+is+the+best+youtube+downloader+app+for+androidPDF 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_off0000ba52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA52 16828 bytes
SHA-256: ac4a784445dd928f77fd5ed53644d6376633fc6fc5ffa36a656ecbf35abeeed0
font_01_sfnt_off0000e550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD67 11148 bytes
SHA-256: 3f245e1ec21994a3b63a287b742295ac83d947a2591aa0c5c8f09a5597a98d9c

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