Malicious PDF — malware analysis report

Static analysis result for SHA-256 5879ebfecd0d3570…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 07:37:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93314bab1ad80bac7482c0ae948b714a SHA-1: bfe6ec73c4ece57bcc06c6c027d4d32eb14dac2c SHA-256: 5879ebfecd0d3570836ea63082f7bdd6508fc67b607b3ced8efe293b0c96cba7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to numerous external URLs, with several hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://interface-referencement.com/userfiles/file/49789404975.pdf In PDF document text
    • https://stealthwindow.tw/uploads/files/202108311956337373.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138381b5671e---nevixaxamefebamevusovuf.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/sapazimusek.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/29516386319.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210906_134316.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/fekevagafe.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/34956055782.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/2909940672.pdfIn PDF document text
    • http://atya.eu/files/file/koravopulusawakugadati.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/zusajeza.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/zodifoxazutitiwabesuxi.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142481c5fbdc---vabevetenajukosawipija.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d3ce09db0841688dab4134fda9e03141.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9a7a50b51---xiteximupuja.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614064a89e76c---debisib.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/mowufusuruwurupezil.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/faxajarojagimifowaxef.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/lebunapaxirilogamof.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/legebuxozenalawuz.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/49738609024.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/68556503360.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/kipapa.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/kipipagewe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=all+notes+in+guitarPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/91888417363.pdfIn PDF document text
    • 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_off0000cdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60D 16348 bytes
SHA-256: 58c4ae0b04a0ff16713ee5deac768514c845dfff102ebb533cd5e442fe0bc972
font_02_sfnt_off00010fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFF 10364 bytes
SHA-256: 7cdf378a2c9babf8b7c55be56cbc3a3c7d8f31419870cd27c823b44bcced0989

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