Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f8cafef69f64b6…

MALICIOUS

PDF

69.7 KB Created: 2021-09-19 12:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f1ffd34ac986e106d3b6825e421b31b6 SHA-1: 8152171c43038c7091bc51a5e06200017439d6d4 SHA-256: 18f8cafef69f64b605c963c7603d786b549f163ce8ce6efddf1ddba2bacc47ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm structure, suggesting the primary purpose is to redirect users to external malicious sites. The ClamAV detection and ML classifier further confirm the malicious nature of the document, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=iphone+xs+max+live+wallpaper PDF link annotation
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ed8fkrfhbaiattv9cvfjpo55om/75980985587.pdfIn PDF document text
    • http://bodybybodyology.com/ckfinder/userfiles/files/74149604180.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/tepumasibasavud.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219261425526.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/darug.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/tulewid.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://lianbang123.com/uploads/files/202109121505386444.pdfIn PDF document text
    • http://beta-rc.com/upload/files/14725722957.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/60614741931.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/kepurudexita.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/45862877905.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/68754551929.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/cfc70fef4e5de79dafc52a9f304abf86/botevol.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/58721346849.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/6817651182.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613807dfdca29---vijowefelalu.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/bezetujalonawebudiwok.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/43449440736.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/xaxolaboziju.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210910150448.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/zebizanitatodusilunozirin.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/jerajasotu.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210909055401.pdfIn PDF document text
    • https://cooperspick.com/files/83699047614.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_off0000b355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB355 10624 bytes
SHA-256: da658c01f82842438bc3cf7c29e015c032e1501e72f546f20a63a36b391bc81d
font_01_sfnt_off0000cb73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 14948 bytes
SHA-256: 903e7f9fd5324d0008b4c2ded3694ea22ebd49806c3ab89135ac4fde436721b9

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