Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea93bf79f861617e…

MALICIOUS

PDF

80.3 KB Created: 2021-09-05 01:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf4bc874f2e599839472c7e053ce730a SHA-1: 124de0baa9b1f8dc52806b67b4fabfe7f9fe9db0 SHA-256: ea93bf79f861617e15ff98a5953a477f4d68fb6b4f3e8c0b0d412d5b1e099428
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous links pointing to compromised websites, many of which are hosted on disposable domains or use link farms for SEO manipulation. The PDF structure itself appears to be a link farm, designed to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/forineripat.pdf In PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/1b321f97a5259f9bf14cdd7fd91a98d4/lobefudilexejovun.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/moxatadoti.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b18cef2f6---rutegibotudupeji.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/fewinibepeduvuta.pdfIn PDF document text
    • http://tradotel-riviera.com/file/17854300534.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609c09646d9fb---suviwode.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a37ab2afde0---51730517563.pdfIn PDF document text
    • https://soroptimist.be/oldsite/intranet/ckeditor/ckfinder/userfiles/images//files/37028115071.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210717202648.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/lbe71v1d0svgq2ecdgschpdb73/38463654585.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/24860541821.pdfIn PDF document text
    • http://i-dron.cz/data/file/zirewafozixizofujar.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/14daa02b1ed3a547a9aca447bbfc7d59/wosuwaxegatik.pdfIn PDF document text
    • https://notrepanierbio.ch/userfiles/file/83097065414.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/jeronanawuvilasudixive.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a77e39711---25428394331.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1d7466758---menebopazabanifelorez.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ec3713bee---64489831679.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/fcf580c6563514b299bbcc793f194acf/78590941584.pdfIn PDF document text
    • http://hidropro.hu/upload/24613380613.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/74430106382.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/87608381142.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ramayana+short+story+in+telugu+pdfPDF 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_off0000d7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB3 16512 bytes
SHA-256: 70285bbd60b8c68cc0ca771e41bb82f2a2e0b75e4c8cb330ec292ebd6a81ec51
font_02_sfnt_off00011a36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A36 11204 bytes
SHA-256: 9e85a0b065a1456efa9b327a2d17dc1553107aba7dc34031246ff3ac47cb0bd0

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