Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa4ffa8ee7877d0…

MALICIOUS

PDF

84.1 KB Created: 2021-09-06 21:54:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d6a14183962fc3afe972de4d165b9ebd SHA-1: 27318b471343e3491fc65333264a887da3c698db SHA-256: afa4ffa8ee7877d0033f1c055713e760b681115eaa1d52624d77b56a7c62c345
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://myblindz.com/fck_user_files/file/notegedirazigedokewanexon.pdf In PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912bae07b15---fanedasefumav.pdfIn PDF document text
    • http://inezorviskids.com/clients/37546/File/76614638545.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b36035bec93---22460222807.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/vopokogozez.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e4cfbc0a574eec0433fea8ee42af5a9a/28000243642.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/29716155826.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/bokebozibupedoxifumovut.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16085bac45a1f6---soxamukefisat.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/3716daf1ecdb10771a112a52de97a3af/39377683278.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/pazidem.pdfIn PDF document text
    • http://sunriverps.com/data/editor/file/zomezevobefopujig.pdfIn PDF document text
    • http://fittbikese.hu/files/file/69884503240.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021080806524473499.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/26659037981.pdfIn PDF document text
    • https://congchung7.vn/upload/file/zipinepaxugujurowo.pdfIn PDF document text
    • http://goodmix-psc.com/userfiles/files/vajimakumove.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/mepokujojobav.pdfIn PDF document text
    • http://aa-nusd.jp/50459386882.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fs8mbhnk8bckpn27kti55g8041/wurimapezuvala.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/dotide.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/tugarisurekivuwija.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa81ec79d1---wafafupebokumisejuxemiv.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/jevumilisujibemujan.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/bivad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chevrolet+volt+2018+owners+manualPDF 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_off0000e31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 11068 bytes
SHA-256: 28dfd39baf46a62152ab5ab90b48c5bad777b8acc897c72b7238d4a670339b8a
font_02_sfnt_off0001150d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1150D 17712 bytes
SHA-256: 1758532777dfc214036888e281fc48a8d51f53cd0c7b0b6280579ab6672fdcf4