Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf020fbcb6b679df…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 21:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d9a542d9ac6c0d87cb2bcd4480600229 SHA-1: c7a64748b17e88b81fe54a94e7760f9349cac701 SHA-256: cf020fbcb6b679dffeac62432ec71c5f8a19a3068e83aad473a9a3c6041ad902
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://prograsifkalip.com/files/79161133687.pdf In PDF document text
    • https://shopabrang.com/images/files/vamirip.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ced6d644450---povatuzi.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a74a59402248c6007747235d6fb50c4f/xonesodapanoxej.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/0895985e8b5aa0cd2359511dc4ec587e/kefolafufojotugezixotije.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a442c4c2eca---tidukeduvemuse.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/xusamegirupu.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d75e46058b5---ziralekewomufidonivati.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/72965406560.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ocupvvbsl1e7h52k8gel8jf4a2/sigopiwejodivi.pdfIn PDF document text
    • https://tdfstore.it/file/wodazakifipe.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/tugodav.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2fcaa6ecf8---74032615394.pdfIn PDF document text
    • http://vejwun.cz/images/tudodazudivelogopumu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161217baa7383f---rinewa.pdfIn PDF document text
    • http://emeat.ru/var/files/lokavitex.pdfIn PDF document text
    • http://whscardinals1963.com/clients/9/9e/9e5fab02d16e7113a74bdd4e7828f974/File/wubinufuwu.pdfIn PDF document text
    • http://chongros.com/userData/board/file/20196509926.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/93916685994.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/302153024081.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/17378645956.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160970d3682539---sufetaxitisen.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/mezavenagujogavapuminu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=headway+upper+intermediate+third+edition+student%27s+book+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_off0000c1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C8 16760 bytes
SHA-256: cddd0e8fda8ffc5a0b9027fe7c3df22aa402a3d7def3b3d10198ee763069fb39
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 11276 bytes
SHA-256: f014679943385adbcb3b14a22f8f42056368f38ef7903817ad69c22171774fe0
font_02_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1