Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ced92fe7a109830…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 19:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f42dba3ec02786185bf36e416f18a559 SHA-1: b5f9fb39a4a7a082c7eb0f22b80cb51145c4231f SHA-256: 0ced92fe7a1098304ed46c3721a404c6ee3eea6a240b1141139f988462247d40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to other PDF files, many hosted on domains associated with compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://fminterativa.net/cms/plugins/ckfinder/userfiles/files/laduzoxinufoparor.pdf In PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/53645857331.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-7/20210907072434201008.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/riwuzud.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/f155b54263502f530c3730be10f1d856/fukiwubowofisokekal.pdfIn PDF document text
    • https://polaria.cz/images/file/30674340246.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139c3e8b3ab9---xivag.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/dadafowu.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/88407461167.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/kadomapigezotewal.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/44701209278.pdfIn PDF document text
    • http://suachuamaydemtien.biz/userfiles/file/67537011006.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/pokawonub.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/78989492613.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/weguxibugukobiselul.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/m2ca719gmfdto16qilqs0p21j0/serezopowekebosuvo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/73afce6f854c48b894f66d3844eba4ab/wexazesamejizite.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///68925756036.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/fukodegaz.pdfIn PDF document text
    • http://studiotecnicolari.it/userfiles/files/84070974656.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/95236538219.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/85609851804.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/18527907254.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613419a4476f3---93347942861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=real+football+2012+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_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 17412 bytes
SHA-256: 06c71d22ae2f83e1918bd0f78c834e19a6f5f95e05dcae2592821ce3745951ec
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 10456 bytes
SHA-256: b0387ce5356af2f067c0c0346c5ad686fd83208cd42360597db045d548635280

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