Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c5773aaf87a3a02…

MALICIOUS

PDF

81.4 KB Created: 2021-09-19 21:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f34d8cf7f06b6d175720fd54ec3e2850 SHA-1: d85b4ad2c54dc5f3c6d8589f3ece0bbe1527c080 SHA-256: 0c5773aaf87a3a0229237529ed9b4269a948706c531b702b6fc7c6d81e3093cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like payload delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agppi99.pretty-match.com/upload/files/zomew.pdf In PDF document text
    • http://caffepontoni.com/uploads/file/49146276203.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/tesav.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/96038943340.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/11318410057.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/jowesipisida.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613171da28f01---11210894720.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/47717706857.pdfIn PDF document text
    • http://esen.life/userfiles/file/92571301603.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16143a904165b8---zabozazowogow.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/68psajvqsr3u6qaaj8kvk43pa9/tutoxawuw.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/8742939645.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/21354150296.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pukewupofa.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/68839420818.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/64041685948.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/dotokopifaxafabisawexelef.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/7rrpmk5mgb2fucm4g5dtef25ds/64443169548.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/58979204111.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/75917495655.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/fozemuvopanobosefavotaj.pdfIn PDF document text
    • http://netflor.pl/upload/File/kaxiso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=williams+pinball+apk+crackedPDF 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_off0000d873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD873 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 18188 bytes
SHA-256: bf245b07d12f7ea8a812b4ca28ed09dcb2bc60c7299fee33e032607f2b9527bf
font_02_sfnt_off0001202d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202D 10684 bytes
SHA-256: 50230194a41ca90e72548ede6509f7bedbdd41a6a29a9b52db862c72e6decc8f