Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ce3ae31804f76e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-10 10:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6bfde83dafb44b383d7d4d3bb8fae353 SHA-1: 484f4d072ab42ec18ff0a9aeb9d639dd9ba41ee1 SHA-256: d3ce3ae31804f76e4b768f00d61a284d02ed7fc6386de5f0035ff5cb471a5220
154 Risk Score

Malware Insights

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

This PDF was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7792

Heuristics 5

  • 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
  • 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://whitesal.com/data/images/file/6074_20210905145955.pdf In PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/76224742904.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/78382474854.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/fovasagiserimeboses.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321357b704c---36528255993.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/notebojobadonefufosafu.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/51215069993.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/dobuwasusenanelunaganolu.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/89583585961.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210909_205648.pdfIn PDF document text
    • http://93564497.com/userfiles/panir.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb210e2ff---veretukukupamuga.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/71791068240.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/dirugofodaradivowojod.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/vozuduxetajajofiwuvax.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/xegatipewo.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/nipidujukexis.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/56853294034.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/tomenufosujunebij.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/pabelomeruparifejiduw.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/57874906299.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/2868188264.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/34594229275.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090901514786817.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161357795d0a9f---49490260125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=mm2+official+value+listPDF link annotation
    • 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_off0000d90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90B 17328 bytes
SHA-256: fbb8b3de1abc1b086cbbc3ad5f78632225c24ff359c2d2c37aa4e673a979478d
font_01_sfnt_off00010687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10687 10572 bytes
SHA-256: 63f4cf652c98e8c24f0ec971fc8934b9018e9c6c022d5efc610344b8622283cd
font_02_sfnt_off00011ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1