Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e332f4ca48db03…

MALICIOUS

PDF

82.9 KB Created: 2021-09-12 01:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68aeaf0ad0ecaf7b033ec8b01f2d34df SHA-1: cb979976c539aeed0ee36efd20feb154db18d97f SHA-256: b1e332f4ca48db03a69ac4a69a153aaef0daaea83aa6c00697696456f0c7f44c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of urgency language further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crysiq.ru/uplcv?utm_term=smartphone+with+emi+in+bd PDF link annotation
    • http://leebyenghun.com/new/upload/board/files/dopelamized.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e3f398c9abb14c6c670faa03b1dcf48f/5439995955.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/e29fc3e50a5413f8d090535e5128faac/zitodovezix.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/bofabemagopaninow.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/120558344731.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161341d428caab---94516581228.pdfIn PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/39036681504.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/xubilewexalasulapedulop.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/v9qpd7slsmlf65i5gvkc5h4qs2/jofogerukevovizogibedix.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/xuzepak.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/powapefosezoranas.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/nenage.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/renunepasodazewit.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/monanerewumudovikujonotak.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/tiximegobaritiwiv.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/76487307813.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/bonomolosajakumawoku.pdfIn PDF document text
    • http://gtlfuelmarine.com/userfiles/file/kidefexekit.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/13541372145.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f27c0339c5---zubezinavuxopo.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-8/20210908092129123697.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/muxibet.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_off0000d956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD956 19236 bytes
SHA-256: a06f5c5ac605ed9b4c674d591a673b62f69719b9b0a900eadacafaebac577767
font_01_sfnt_off00010bf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240B 10744 bytes
SHA-256: 0be6290b22237db60eb6d3239b3acef44ce0bc6712b03b870db936da6b800337

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