Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd943a9de148e52…

MALICIOUS

PDF

85.6 KB Created: 2021-09-23 17:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 24469dd1e87c75d947c70fc213b5bd33 SHA-1: dc58cf6d3b1afa0600c9b7d65b8d06ed58e30212 SHA-256: 9bd943a9de148e527abf203c75bf360e28721d22a7210a488948c48e8297f340
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://konzolstudio.ro/uploaded_files/file/1714060283.pdf In PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rhum89a7sr0h2mt3ls5kl3r9sj/dofojofufifegosumilivifiv.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/rupaposeniv.pdfIn PDF document text
    • https://durimawar.com/contents/files/bawolo.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210922_215331.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/8108101682.pdfIn PDF document text
    • http://tonwen.org/userfiles/file/vetad.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/nuwikoxofitolimaduzasilak.pdfIn PDF document text
    • http://superazs.ru/images/news/file/24782783084.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/leduf.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/tomajizozuxed.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/67880596594.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/vudezi.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/nuxolowelebetokeweso.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/laguwidud.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/55221036790.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/tikimemukugibuxitefobib.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473e7dd9a5---86846009760.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/72588905349.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614007c959e26---noruxeg.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/wipamazuwatagodawa.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/0853ec.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8fe542163---2268544119.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/bisunoligapevetawika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=real+credit+card+numbers+that+workPDF 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_off0000ea48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA48 11100 bytes
SHA-256: 7ff505796486a78633f5825dd14072c45e22680ba7f4df2effc3407e67957055
font_01_sfnt_off000103fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FA 17224 bytes
SHA-256: 865e04d65981516d50491bcdf03bbba24df72164a20478052c6e1e27beee4bde
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1