Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fab0965b4cfeaf…

MALICIOUS

PDF

83.6 KB Created: 2021-09-07 05:33:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 2100cad95c7f11051b6e15e9396d086f SHA-1: 04f14b97c21310599c9034ae7c0749860caec2f8 SHA-256: 53fab0965b4cfeaf23cb9d9550160116150f00c66d763a05aadf12b85d4e8e17
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS platforms, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

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 https://philabc.ru/uplcv?utm_term=merge+two+pdf+files+java PDF link annotation
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/neziketixidopalok.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/6vntblje35doidn7hbludgpjg3/puwoxovele.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/72144989378.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160956c0ef0ef6---warusonivobajid.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7759de9ac---pisufelelugi.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/24201279719.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3134094c27---sebuxopav.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/nelegoritasuwibedezidel.pdfIn PDF document text
    • https://proia.bg/userfiles/file/41950397135.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a8267ac0a---porawa.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/tawakobewovov.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/20059912404.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/94720561978.pdfIn PDF document text
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/konuxilebud.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6437491a8---vorokij.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/89284023152.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210902_536EA0CA3B5BDEB7.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/22705529905.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/merusudalafemaga.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91c04ecaa5---12798240243.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/bf8f567bef928fd4c55ddc39298c6094/14428334496.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/wunedodilexiperedizowenif.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/tv256mic5geqjsme5hp2sk32h5/17517269682.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/30649579761.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/44205651706.pdfIn PDF document text
    • 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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10844 bytes
SHA-256: a6ce32301c02e33a2b012840938db4f7dd8cc0490e384db664784d182fc026a0
font_01_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 17548 bytes
SHA-256: f62e3d4f7f39e21460b54e96c89d301d125c96ec52bf334c380f2e780b3b8fb2
font_02_sfnt_off000128d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1