Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c73ff420011bf91…

MALICIOUS

PDF

58.1 KB Created: 2021-09-05 00:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2e609731c37c14cc5d8c9020ca33493 SHA-1: e886d7a7e669679e7d73df6dd386982cd579366f SHA-256: 4c73ff420011bf91615b84d0c6039c86eb63b797ef5396fbb66a9fef92175de5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is identified as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface with a click-outward action, directing users to a link farm hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be redirecting users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8087

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 58 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://jinruily.com/UploadFile/file/20210815175922478.pdf In PDF document text
    • http://4seasonstours.in/userfiles/file/gadetijoxalemegotube.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a69f7eb1dc---71873868192.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160afc4b94d9c0---41653258340.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210726104146.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/b6da45ae7v459jk5bjoqrllgdl/14532158402.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/a23dec3962b87ada2162d1d56e548ad4/nujirimate.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/jajogozoxomusiwib.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/rujarewupibinedalo.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160736f981d6c7---sududotugum.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/okddorsvji7f52pg8l2j8elvlh/9078884782.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/wejumazutasonalol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110328dd6385---11196874049.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f4ejjtjb5cfquh3k66b9ldtpm1/58573947526.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/47977074918.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/62360346590.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/60583257602.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nmk4tsogkhua2t9qff0umq1162/20372262462.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fa65vv29vqc74fjedbmdqiod80/29286175367.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/zotesopimudeladuzu.pdfIn PDF document text
    • https://ipic.vn/userfiles/file/pozokaxokivazovuku.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09526ad544---kudufav.pdfIn PDF document text
    • http://sinosteelcode.com/filespath/files/20210822015948.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/ruzavarugulo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=realidades+2+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB212 10236 bytes
SHA-256: b4c62c109dd7d8788bed988543b94f8762281f8f6dc0ed38991c21087294458c
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 14108 bytes
SHA-256: 6a8304d8a096a3a075490ad0a4e0b77a811022c0e72756bacdd9d42face7fa1e