Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b1708f58467a377…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 11:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4547b26316c13f5b319268335c943b04 SHA-1: 1d380f0a1897bb80ded57a9a0409084455d9f318 SHA-256: 1b1708f58467a37773ff2e5ff883c82581edd65e1420dae33ddbf758c0ac6a7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=ppsspp+football+games+download+2020 PDF link annotation
    • http://kstarsmall.net/userfiles/file///wudaxutawavud.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1b12ad57e---99049113391.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/lubugenarogotavunigite.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/97dee3e0a9e5b742bfb6bf76faada883/xijisetobiru.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/23133951874.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/sebex.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/15997184767.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/4d40f21d77726172c2bc23003086e91e/40571533427.pdfIn PDF document text
    • http://pk.mo/userfiles/file/zulugogake.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/lodexisigigetinoxisuw.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/femamigikebuko.pdfIn PDF document text
    • http://pk.mo/userfiles/file/106645129.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/bumifu.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f23833ccd---17281996433.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/lenute.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/duziwozanunubuwe.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210913095551.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/92842547251.pdfIn PDF document text
    • http://www.hgekc.com/media/userfiles/file/zujezu.pdfIn PDF document text
    • http://baove24h.info/upload/files/gexelevurakujurewoda.pdfIn PDF document text
    • http://hkwwta.org/userfiles/fidorabazep.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/339912fc7021c4cebbeff551038452f1/3700028648.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426b5bc3483---talavinazikopurire.pdfIn PDF document text
    • http://posuni.com/userfiles/file/11446448306.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614226b25855c---16256994139.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_off0000d8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF109 11116 bytes
SHA-256: f57d5d7220a2c848cd5055d84161b6a772ecdd38fc8df94f271c245f1a82f2da
font_02_sfnt_off00010ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB5 16712 bytes
SHA-256: ec433c64140bf383eff6239327412193aa15847df754342ee1a96976fc0e1783

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