Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e391597605d557…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 08:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a9b5400b742ab9fe1c9e89ad434f8d31 SHA-1: d83f51350be6b014ffc9a9a37d59834e8f127a81 SHA-256: 97e391597605d557e1784a67625478f31136baf18e36972d7a75f0eea7262523
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The document body is heavily obfuscated, preventing analysis of its specific content, but the overall structure and URL targets suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/b69e9912989acc0d4ec63870d88ba877/94071435070.pdf In PDF document text
    • http://sl-light.ru/design/img/upload/file/70707901783.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/17206921794.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085eb1cd9763---13631082559.pdfIn PDF document text
    • http://prociweb.hu/sites/files/file/bagigigazizifawemejigavis.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zudunanuxasesibebew.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d161357d5---83926863861.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/sagixazonap.pdfIn PDF document text
    • https://togeltop.net/contents//files/12643182524.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o1gd4bmeloqi36d2472g4v13lh/pizifadadogesogidez.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/47014774915.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/bopopenuzix.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/440405385.pdfIn PDF document text
    • https://tcremich.lu/files/files/53188577754.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/51158984988.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d127cc595---fedajorolanunuvati.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/kenuzivojeromefaxa.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/85426463248.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021072007511673499.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/fed25ccd70469b29c155a930f359ead4/99219114591.pdfIn PDF document text
    • http://flatadministration.com/uploades/fckeditorfile/xejojozunebomuropofafur.pdfIn PDF document text
    • https://xn--faade-zra.ch/ckfinder/userfiles/files/garadutikovonoganexorugaf.pdfIn PDF document text
    • https://hmradiatoriai.lt/images/files/79655329165.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/pezirurogidofurudi.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/napijunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nobody+like+you+lord+piano+chords+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_off0000b8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C4 11044 bytes
SHA-256: 83bcd8dd0eb4fb7a8600faf942af7a63998bb4fc3e20adba519318124cd12f7f
font_01_sfnt_off0000d222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD222 15936 bytes
SHA-256: 9c904322a28190debcd70926a1fa8efc814fb7f42601dfebe4311edc4fe6f856
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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