Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66e05604a1f0b0d…

MALICIOUS

PDF

70.5 KB Created: 2021-10-02 14:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 47b2477fd5b9b4b548edddac8536ed3a SHA-1: c8225643c4725ca6c77cf9841adbf2de66048104 SHA-256: d66e05604a1f0b0dbdd7e12c9bead1fffa208fea4f7856d3bb61cde6377cf69c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, limiting the analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://foodphotoshop.com/userfiles/files/japelopesegumodunetu.pdf In PDF document text
    • http://walosports.cl/userfiles/file/98070217105.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/katisawubitobofosozokuwiw.pdfIn PDF document text
    • https://biomisszio.hu/tmp/tesowakibukuj.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/bevosuximesoxikepij.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133d9337d1da---xepidisupe.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/vedipoforelamonixogit.pdfIn PDF document text
    • http://hmed.vn/upload/files/lujakuzizepomegesobisaw.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/28044273581.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1614c229989ae6---muzegegaxasijogijafekuda.pdfIn PDF document text
    • http://csc0451.com/userfiles/file/20210916122758_ixninv.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/15981383603.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e62f753bd2---fapufuvobojav.pdfIn PDF document text
    • http://atrsara.ir/resource/files/betuwazar.pdfIn PDF document text
    • http://teakdeck.pl/files/file/30893879550.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/sapolanizu.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/zuvewozos.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/40536829886.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/riganipore.pdfIn PDF document text
    • http://montesantangelo.it/files/files/6187003852.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/6251798563.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/zojomenoximufemaxu.pdfIn PDF document text
    • http://zima.italie-ubytovani.cz/data/file/51465571350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=character+defamation+meaningPDF 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_off0000b31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB31B 15912 bytes
SHA-256: da168ca999f829a32b93584b1d2c05f0373c64af99d291ab18ee3dc2488f8c15
font_01_sfnt_off0000dbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DC 10740 bytes
SHA-256: 686961f731c1a89bfbfbb1412eb58be6a4d0c442b81647e1783a3a4a4653be24