Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f332b3d814d529c…

MALICIOUS

PDF

80.2 KB Created: 2021-09-11 07:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2a26899c98c0d4a23b2d7fbafc5f2d2b SHA-1: 9ec2226dfa22b22a8d9728686f5c62241c51a8f8 SHA-256: 1f332b3d814d529c214becf88b0605d8dd09008b7a7a01efe3bf08453b42b1e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing, as suggested by the PDF_Phishing.Trojan classification. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://loffoxfitness.mvwebsolution.com/userfiles/files/50658818814.pdf In PDF document text
    • http://colokit.thienlonggroup.com/Images_upload/files/nalizamafesafok.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/sibogexufajifowukod.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vopuvukemi.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/manom.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/71151512422.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16139b138d91e2---22404962868.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7adc99e58---51361764353.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/76138207568.pdfIn PDF document text
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/5715810055.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/sijikuvorije.pdfIn PDF document text
    • http://chongros.com/userData/board/file/bazomegavuzawusenimore.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/paval.pdfIn PDF document text
    • https://coil.hk/upload/files/11991933644.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/63978655758.pdfIn PDF document text
    • https://www.hkha.com.hk/ckfinder/userfiles/files/fidetitile.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130327062e05---feveda.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/89750851167.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/tujidikuto.pdfIn PDF document text
    • http://airzo.net/userData/board/file/70429756753.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/86724170817.pdfIn PDF document text
    • http://tabletopad.com/images/file/75248801389.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/14698151823.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/xafitufot.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/45654402669.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=real+driving+car+simulator+mod+apkPDF 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_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 11160 bytes
SHA-256: dd9f9e55a69d016be99ed3b8ed4122c025b72b19120cad708ea6766eb093124c
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 16824 bytes
SHA-256: 346c1595332a3ac1aef84c7b1e838360ac22e3a6e8628f16828fb92956a95110
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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