Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6c624cd73e14ad2…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 22:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb0c78c2562ec5ee85616e6358804eff SHA-1: ab89a4c03041a8801276d96d563df4dab3617ff4 SHA-256: d6c624cd73e14ad299d24d72fc9916572c3e52fbc8545a2e4fd33ec46731d148
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The links appear to be part of a link farm designed to redirect users to download applications, as suggested by the 'utm_term=video+mixer+app+download+for+android' parameter in one of the URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/30561173304.pdf In PDF document text
    • http://collegium-connect.nl/ckupload/files/dasaludusup.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/putuvukojobelekivonimu.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/sinarubegorijilibux.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/84373547967.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/wezubodoroxokakemibil.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/xuxoduturetim.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139f735295db---67685028068.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161397ebfc4c18---letukafodepizaxexajekixil.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/nudinunuduvonaw.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/lanerugamaguvofigav.pdfIn PDF document text
    • http://whdhgs.com/uploads/file/20210907033742701.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/loxuvumigexokafapuvuba.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219805038591.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/81905144902.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/3382680844.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/161331f090607b---10315175229.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/87691960804.pdfIn PDF document text
    • http://rapet.hu/files/2436850381.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/91219412530.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/totetarekenenanawaxasul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=video+mixer+app+download+for+androidPDF 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_off0000d678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD678 10552 bytes
SHA-256: 0e24ab13e61557f8c3ec684b501094ca0920752a57a57f610aa8f10d534747db
font_01_sfnt_off0000ee80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 17704 bytes
SHA-256: da7cf707b703b1861f020f2ef419299a8cdbf2379210ab22ca251f9774dd3534

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