Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c3930da3c66216…

MALICIOUS

PDF

71.4 KB Created: 2021-09-14 05:33:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4003c7bcbd466b9f8d0b3e1cf5d53d14 SHA-1: 098177adab715ee4a41610d780b899e8cd37452d SHA-256: a8c3930da3c6621669ea42ffd8296e9c742df2f7dbe3dbb1fdc72d2309edc81e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple disposable domains and compromised CMS upload storage, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://educhina.mn/editor/files/sunifawowiwogebef.pdf In PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/jesuriped.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jowon.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/baxojuganaded.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/filodetolok.pdfIn PDF document text
    • https://snf.styleguides.ch/userfiles/files/17473493259.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e96749b404---ruvezape.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/zabuzez.pdfIn PDF document text
    • http://dc-42351dc5a6b3.prshots.es/uploads/userfiles/1630708675/files/vowimevevoburidif.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/enklro44kf5bkj07gkap36170p/sofojopakafipebitomemu.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/25734785843.pdfIn PDF document text
    • https://hinaweb.com/upload/file/40809753005.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/tusovujaseb.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wirijinaguvupijal.pdfIn PDF document text
    • https://mintowncoffee.net/uploads/images/files/38226499931.pdfIn PDF document text
    • http://congtyvima.com/images/Download/tonuxodurebafelugobuki.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/fibukurijokotopuko.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/48368223389.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dbaec18fb---41860414452.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630623052.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210902_6E7E0D0AC53C92A5.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613597a0e2ca8---63638827894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+drop+down+list+without+spinnerPDF 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_off0000b5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F0 16292 bytes
SHA-256: 9b4d177be88c96c84af15a28a3109223e955f63d52a416452b25cad67e33840d
font_01_sfnt_off0000e026.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE026 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83D 10496 bytes
SHA-256: b76dd326089d9f8c41fff42c2c8f36dc5ebfb02797a881f4876c25fe5032d8cc

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