Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef5de54caa52ad2…

MALICIOUS

PDF

82.3 KB Created: 2021-09-19 06:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed52f93ca1def825f7e3e110ff422ded SHA-1: 7c83855681620b10a703f24b6fc78f3f9d501d0a SHA-256: 6ef5de54caa52ad2cc1b0074360e14a79f93918cf9ac975f2ab98e1557cd6ba5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous external URLs, many hosted on potentially compromised or disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=lineage+os+raspberry+pi+3+b%2B PDF link annotation
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/bejovaguritamiwugusapul.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-04/2d06d8bc765b1f831f4f0c4bf98438a8.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/dokemarigu.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-16/20210916230926216308.pdfIn PDF document text
    • http://prograsifkalip.com/files/83926249852.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/92224406338.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/bewulujizulozevu.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/liwivodigepalal.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/13288290094.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tadatefez.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/82869042526.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a17bd29871---subomaropolodegifeboribi.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/kinedapoli.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161465f4b87b53---turedezegifox.pdfIn PDF document text
    • http://fsf-vastroad.com/userfiles/file/92550129236.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210901_04257A8074A9A076.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/fesanuduwolejawedufe.pdfIn PDF document text
    • http://soles2walk.com/data/file/lizonilukelubax.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/10707362197.pdfIn PDF document text
    • http://vladekoservis.ru/files/mamiviromenofisamataku.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131720018875---wisasajamani.pdfIn PDF document text
    • http://riversedgefm.com/files/file/83426683242.pdfIn PDF document text
    • http://mt-filtration.com/uploaded/file/2107370194613f8c9416306.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/45661151579.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/zofebebiwowuxawazewederaj.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_off0000db3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 10664 bytes
SHA-256: 05930022fda7d7c7df639ae3e6d2b20871eee8d32e6f4109853144c39f40125d
font_02_sfnt_off00010ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA6 18292 bytes
SHA-256: c4071f4fc1a08efce460543fbd05415146d1a2ad76bdc800b64cda9cdd8a8be1

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