Malicious PDF — malware analysis report

Static analysis result for SHA-256 f498600069bd9578…

MALICIOUS

PDF

76.3 KB Created: 2021-09-19 01:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0239596324c460e326f6db9ef82e80bf SHA-1: b2d7d6e0e62387fd59881d440b11b593ecd5506f SHA-256: f498600069bd957851d7e9fe18e56b6149e5bf1004a0984f78accc91020aba6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://wastran.ru/uplcv?utm_term=ultimate+brain+booster+mod+apk+download PDF link annotation
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/mofave.pdfIn PDF document text
    • http://banquat.com/userfiles/files/gixetumozokidamiwudetetox.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145716181ed9---6106865334.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/dadogevagobotiziwa.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/62848804717.pdfIn PDF document text
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/6392662304.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/62761147934.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ginikibafet.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/ginegixaliwanovara.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/62083653622.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/fimiranilefarew.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/89455929647.pdfIn PDF document text
    • http://uralcomservis.ru/crn_fls/crn_files/56191774807.pdfIn PDF document text
    • http://kaies.net/upfiles/file/39827475994.pdfIn PDF document text
    • http://keacg.com/upload/files/jimif.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/dakexapoxemel.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xudekisuretinoruwod.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/64931849434.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/161310831311f2---38201916032.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/15844325748.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/81706254421.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/kejovezamaza.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614042a104306---bofamanadowujabugadidab.pdfIn PDF document text
    • https://ratodua.com/contents/files/zinarabawenimamiteloxaj.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/8158811364.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/1966105326.pdfIn PDF document text
    • https://mpksieradz.pl/upload/file/vuvotizo.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_off0000c6d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 10880 bytes
SHA-256: 26c2f39d2afff5bacc5dbe03e38e71233b50d20434c19c5fad1215e218ff2072
font_02_sfnt_off0000f7e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E0 16768 bytes
SHA-256: d9ec87146c1a6ae1e3f8c3d70178edc5b5e9eef5c02e8380af82103a6b5f35fb

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