Malicious PDF — malware analysis report

Static analysis result for SHA-256 954d78bcd7b8d30c…

MALICIOUS

PDF

97.0 KB Created: 2021-09-15 18:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 98e292ff5efaec9820df172bcd6a2d77 SHA-1: 74458078b4cd7b88a3383a1163e739b77136e776 SHA-256: 954d78bcd7b8d30c68ffe0b669492adf74bd48c5793b43a7eb02bf1f5f4b7655
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to various domains, many of which are hosted on disposable or compromised infrastructure, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a 'download' button lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zuche0551.com/upload/file/lowarezofidamonidotaxo.pdf In PDF document text
    • https://leganordavigliana.it/uploads/file/simedazexiximubedud.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/liluda.pdfIn PDF document text
    • http://stagticket.com/fck_upload/file/jukonovonapowawetes.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133b14885db1---fotezojepuvuv.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/97164673057.pdfIn PDF document text
    • http://sourceandsecure.com/uploads/userfiles/file/92518694216.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161322aac200e5---ratowaboro.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/xukazatuxil.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/velidalajoronolumujob.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/palenalanebefi.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/24323872253.pdfIn PDF document text
    • http://roomyab.ir/basefile/roomyabir/files/44584793366.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/72238973003.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/83177001611.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/fubonoveleja.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/senajixesalotuwamel.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/bawafozovumujemotab.pdfIn PDF document text
    • https://eclearusa.com/images/file/divakesuso.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16131a956a14b0---fobasafuses.pdfIn PDF document text
    • http://tscyw.net/userfiles/file/20210915220610_zmz8ip.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/11150096581.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/q3ou9e6ol3g4hkovjemjt2ofpr/wubixeturipozi.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/wefavupajopoma.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/22902202585.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16136d346a1903---62696235973.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebaee0aba4---tewowijuwezoxujoze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=international+law+by+sk+kapoor+pdf+free+downloadPDF 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_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C2 19200 bytes
SHA-256: 6883417bffaa33d6b6705c3a39785f01f825ac63b799c41eddb8ef3245e7c89d
font_02_sfnt_off00015c6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6B 10872 bytes
SHA-256: 07cf4cba37a39977f992d900234da0e4c8db2ffe73e772d86a246074267017d8

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