Malicious PDF — malware analysis report

Static analysis result for SHA-256 15cca8b817c4c1bd…

MALICIOUS

PDF

82.3 KB Created: 2021-09-06 02:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f71ffd6585430ac747f2009b594a2e80 SHA-1: af7040fb34e18ab8c2f1ccb9a1c2370ed0ab21f3 SHA-256: 15cca8b817c4c1bdb8742a1f5bab24d9588ce16b822d8e9834422cfe1efc58b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised WordPress sites, a common technique for distributing malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072fc88d4609---27245818485.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609030de01947---83626678201.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/q8j1bn826gvs0agsq5hbheat9m/8263317049.pdfIn PDF document text
    • http://immopolignano.lu/images/zogeruvowoti.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210628_175507.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewezabolawixarela.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210707_A6F610199E1A1181.pdfIn PDF document text
    • http://momsystem.ru/public/file/bizubide.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/rc2gjgv9u7oj796cjt0qoklbf5/45919779906.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/badawabazedifo.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9e9eaaa7---33903637911.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/dipad.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/24893010873.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/mafapabetenevadu.pdfIn PDF document text
    • http://webbuilders.com/files/file/begeguluraxepowegazelix.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/58092822671.pdfIn PDF document text
    • https://banghenails.com/upload/file/lolikexatazi.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610378ddb9e0d---13731459861.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/4eefa4d7ebcb1bd06462e4d9dec645ce/pobupimogudeno.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/23449798648.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/zifimezelovifubuxexudo.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/totivuzuvudikob.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/segikaleruna.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=piston+pump+operation+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_off0000df2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2A 10716 bytes
SHA-256: 2fac79ad17928084af00a4824213e02c8e9b4facd84aeefcfa952b6f9e23b869
font_01_sfnt_off0000f7c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C1 17288 bytes
SHA-256: c5a501e75561c7ca472f88c7150ab7f96a2620395e4787eb5254eaa9b0851bcd
font_02_sfnt_off000123a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1