Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f427b976ac251a6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 22:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6c7619cdfffe9d23066fc1939f610b85 SHA-1: 07c97933252bcc4e0fc306a00f4d65a19ecb3dea SHA-256: 8f427b976ac251a6815d018c5959060b6267c57925b08008165d738ed3f763d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kamkmori.cz/ckfinder/userfiles/files/wogugosugabolonixuruvi.pdf In PDF document text
    • https://penzionradvanice.cz/res/file/ledapajivage.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/sotazozo.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108100051394576.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/33308774377.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/mixuwogulevazude.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078fac8555d1---nojaxalavinemelif.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210719013401.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/zevibofiputapo.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf852c52---padelewubu.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/falutovozefid.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/34266949697.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a27c6859584---49952844877.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/78208289865.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160dcb70585a33---mejofidavatow.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1611f840878531---79396340041.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dc2f7cdd4d---56569159680.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/6dfd9cf5489ce9d42e9526d61c6aee2d/47617557309.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2ce4d14e8---bukomodid.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/8914649647.pdfIn PDF document text
    • http://gro-felix.si/uploads/pusajonokopukov.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/niwewutupafiv.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/fedukololimiratut.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/7932aed7d7950926976bea11b38ea651/2048847581.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e678387040d50d36751014634c09a592/zukusuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=advances+in+behavioral+finance+volume+i+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_off0000e09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09A 11076 bytes
SHA-256: 3a3eebd20ab50bfdf49d3badc73f19362eb88db608d3b3c41cecc47151737ae4
font_01_sfnt_off0000f9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FA 16792 bytes
SHA-256: 0c2c482578a3324674d8f594e585d808f16a490ee9d49138e658353ba9241749
font_02_sfnt_off00012573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12573 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1