Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6586f72f9e312e6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-21 21:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3472c816c21f9215a9efe4773083df7f SHA-1: 831a35ddfac0cf520357a2392c7102ca91f0b3f8 SHA-256: c6586f72f9e312e6d259cdb97cf8d0f0503c7488fd7f059e83d4aa5fce7154e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. The document contains a link farm pointing to compromised CMS upload storage and disposable hosting, designed to redirect users to potentially harmful content. The presence of numerous links and the nature of the hosting suggest an effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://chiaranannini.com/userfiles/files/dedumagodigana.pdf In PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/44297870468.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/19167094756.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210913_021B599312A23E0F.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/8509859d596bbe63c652d4b42b37529c/84036328530.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408bf27fd81---71663690863.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/66248045741.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/nekuxobudewewokerulikuni.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/xavedibujadijupazalorasuz.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210908155224.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f09739a6e1---46206471782.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/50137902355.pdfIn PDF document text
    • http://ninda.vn/userfiles/files/bazutopavaja.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210903072311684.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/44652265797.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143482b61166---19805619567.pdfIn PDF document text
    • https://buonoantonio.it/userfiles/file/49871009739.pdfIn PDF document text
    • https://ultralloy.net/upload/files/55483852737.pdfIn PDF document text
    • http://dytac.hk/userfiles/gipokeluwutotopeke.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/5400909246.pdfIn PDF document text
    • http://praguetransfer.com/files/file/78584280573.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/37392689728.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/73095029602.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/fediluzodugej.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/14109668269.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/59187817251.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=live+streaming+india+australia+matchPDF 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_off0000dd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD34 10820 bytes
SHA-256: c1414c0fa8cd27c4a0cb5dc9b00423f760ebec4d6bd1d06c0814f4aa17ec6050
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD6 18260 bytes
SHA-256: 074294aa5ad49122a8b73e8c125499e380158b6f8bfc673e7357ecd8bc091d92

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