Malicious PDF — malware analysis report

Static analysis result for SHA-256 018f26dfb40d7e83…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 15:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5c08196ab30c08a5340242a3690d320a SHA-1: 96d2a9e3182f9ffc63b15bd5e3300ecf7549e35a SHA-256: 018f26dfb40d7e8356f488b3ffd19b66c087c51179341792078602e9cca5f686
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of a feedproxy URL also suggests a potential phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.celso.org/download/nolenezodabisoratoxawu.pdf In PDF document text
    • http://jjc-dev.com/userfiles/file/10231578268.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161355f4b9a765---paperedifogemikawatuneled.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/95443447630.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/retopadalewazu.pdfIn PDF document text
    • https://ms02bet.com/contents/files/802889329.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/kekivalubowopuz.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/99404997282.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b8ea1a1d---fujofasamanamibimorib.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f21f8a74e---zitekib.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/12372420194.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210915193419.pdfIn PDF document text
    • http://vina2002.com/uploads/files/26568556272.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/fisiduzuvinepum.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/faduvaj.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/26300173710.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138468894df5---filijefutubedogekud.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/xisututalepijenizadak.pdfIn PDF document text
    • http://china-miyaco.com/img/file/202196221148.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/27034084874.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210913151354.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/xiranotojuzab.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/besoparalaguwixi.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/pepupixuzeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=beat+iy+pro+apk+no+watermarkPDF 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_off0000d6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DE 10544 bytes
SHA-256: 45946a08a2694add240df7ddf4d85300f3cda676d43548fa98f44a4b08c5c391
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 17284 bytes
SHA-256: 3f2e459463d38d6da8c4d885d8a5126fe9d847b1af022ed06be4d4d2b291c019

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