Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e9e0b6d98427cf…

MALICIOUS

PDF

78.1 KB Created: 2021-10-09 08:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 16a4955d4cb48fc7618e943b324aa140 SHA-1: 45def522a437776e345020425f9cd7d535a3d1d7 SHA-256: 84e9e0b6d98427cf3160754e70997d4a6c0f21a08e5eed25ae5824d369cf3ad8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.mousumibanerjee.com/fckimages/file/gusel.pdf In PDF document text
    • http://vladekoservis.ru/files/44542236514.pdfIn PDF document text
    • https://www.colegiumaniucarei.ro/ckfinder/userfiles/files/6944503313.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e399979db7---18970656404.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/silama.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/9dbc911b1c7846a4d75bf4c3a2ca68c8/19139083200.pdfIn PDF document text
    • https://keyword-lda.pt/site/upload/file/84106389960.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/didomagu.pdfIn PDF document text
    • http://bluelakehomestay.com/uploads/image/files/5048768145.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/nutexumipovarabutok.pdfIn PDF document text
    • https://tarsiman.ee/files/file/17630100774.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/19966402216.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/53724515947.pdfIn PDF document text
    • http://dhalahoredeals.com/survey/userfiles/files/76217254055.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/towedexijikaxala.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/zubesorulinurokesarimu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/937828352e9687136f84e149c84257c2/semofo.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/sopes.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/65665559978.pdfIn PDF document text
    • https://turbooto.vn/upload/files/26096429436.pdfIn PDF document text
    • http://artediapharma.com/upload/files/xewunanexekesasuzigafew.pdfIn PDF document text
    • https://ms01bet.com/contents/files/28723010999.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/64834075951.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/78068483057.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///42130874159.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wise+and+foolish+buildersPDF link annotation
    • 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_off0000c969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC969 10588 bytes
SHA-256: 9e0ae2107dd020df78dad244931f24deb9d1d8c7a93740388f4e4156c700cf9b
font_01_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 19148 bytes
SHA-256: 921bd8e578398d8fa153b808d1b057fe2412ce2852a60cc077ce973540f86bb2
font_02_sfnt_off000112e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1