Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb917afa5a14110f…

MALICIOUS

PDF

67.9 KB Created: 2021-09-01 21:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: dff6e1f4a543f7f18df6e847e5f61e6e SHA-1: 199f98221d56a6332bb554ff8f86e8df4fde04d8 SHA-256: cb917afa5a14110f8493e5ef22f7a77d3e61970b3e4e7a35a05e83ce0a6716bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8990

Heuristics 5

  • 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
  • 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://www.euro-fly.eu/userfiles/files/64728407390.pdf In PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g3vb0b147j4p5cggus7kg4lv5a/vefozefimukepuwis.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/jitutijedagitil.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/b4r6dcdap7n1ss73tl4pjmrdj0/nelisawavonopen.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/36214967835.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/ziduber.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722f14c3d6a---luxuj.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074a161c36e5---97720648333.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0tudionaemg5urui8lm1lbdja/jofogufabukamutebol.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/44393091110.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/dapoxitowafagatiret.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/97816464801.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/gerovedaremedulurot.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/55216556001.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/61551592358.pdfIn PDF document text
    • http://nature-revive.org/files/file/42577116334.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/v35ijfl63uhe66dkn0n5hhjmau/jimeviravuzogi.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48706391772.pdfIn PDF document text
    • https://totounited.com/contents//files/80712416644.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/80252023323.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/bofatidavilizasarolul.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/86397211781.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d36a75b5f2---bexonusig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=use+of+marquee+toolPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 17208 bytes
SHA-256: b1b1564f174ac159b1c65d852d003a4fbb346cf1aa4a0015d47f921e931a1d64

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