Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd9c57cf9f7c74b…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 03:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a27bec20b14a475f5986c19654bb7de SHA-1: da0d18d66a411123fde2ab2147b47c81416e7809 SHA-256: fbd9c57cf9f7c74bbcbc7fdcae0cd0384ec947a5aeee887830948b478b5332d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate the PDF acts as a link farm, pointing to various domains that host other PDF files, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • 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 http://aitrans.cn/UploadFile/file/F1202109140935251730.pdf In PDF document text
    • http://kolaykanal.com/userfiles/files/2576876235.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/fepebaku.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/87542434410.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/tubokafojowujadi.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2d68104e---35439142083.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/vujakanudi.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/41807754873.pdfIn PDF document text
    • https://mollis.rs/files/lagopezokededab.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/99927288930.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/31602350295.pdfIn PDF document text
    • https://montpellier-business-plan.com/mbp/upload/images/images/upload/ckfinder/simuwuxafozukabo.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f059eb3cc---bizugevak.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/75882495815.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/lepuketerevimosevavizix.pdfIn PDF document text
    • https://sammycar.ch/sammy/sites/default/sammyfiles/newsletterfile/55041910435.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/33714776581.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b880823b52721dcf8215f3abbee868f3/xemagatalis.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/dukifogonojagevin.pdfIn PDF document text
    • http://bischofs-scheune.de/userfiles/file/powagaxerutifenunuzaba.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/97448998252.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/dokopetizezosetarazaj.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/benekilile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+real+john+proctorPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615592f45034a---lebuzobitifipumonep.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_off0000b38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB38E 10304 bytes
SHA-256: fa13191a4dd9759d82ecb31f3da28a440fe460c62daf1ca8f4cf2b4bf7ced8fb
font_01_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 14840 bytes
SHA-256: 94646daea867be38ae0de842d659fb71afd44a92147758df9aa3d29f0b0436f9

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