Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aaa779b3c3b2fa1…

MALICIOUS

PDF

66.8 KB Created: 2021-08-23 21:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9ade7cb6325174eedd8fac467d00146 SHA-1: 6135963bb22208e745ee239f1d08c59094565203 SHA-256: 5aaa779b3c3b2fa141f100fd77c57823dfd38e796f46fcdb86e4eb896e68e64b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised websites, specifically targeting WordPress upload directories. These links likely serve as a lure to download further malicious content, such as phishing pages or malware. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7779

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 http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac2e121ab5---17942940398.pdf In PDF document text
    • http://abacusnancy.com/userfiles/file/87159968434.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zumon.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f7a45c3d09eb788f2f3cf8e3a8789046/nariredipimugeruwej.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/bqmne0fotpl9d04mfni71e60c0/jotiboripolugopezowip.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4010aa4b3---39986693082.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/6498578009.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/e45c188d17c04fd69259e06c6e3b404d/87092829868.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/89263981621.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/43402412527.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c10d4ba7dee---fisatatagimetufulef.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0a34daa3b---kajifoto.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nghano630g63n1i030ans6thr0/tatuxebezojasip.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab91b7f682---taregimopoxerusozeku.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/57446052441.pdfIn PDF document text
    • https://tomas-music.com/contents//files/24310090993.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntjkg1rf9ltd3j3l035covfd60/74659894630.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/pivunezimov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cute+words+that+start+with+kPDF 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_off0000dd80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 10504 bytes
SHA-256: bf8fb553bdd0b91ee25816d80653e4da18ddd0fe43f0a8d3ea6ee2071bee0624

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