Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6008bc86f2c19eb…

MALICIOUS

PDF

82.8 KB Created: 2021-09-12 16:14:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 73422172ea5ea5ad2583c40b8ac6fb0c SHA-1: be2057f0614d99df2aa80287f104f0d683bd86c2 SHA-256: e6008bc86f2c19ebaff739774b79081ae317ec1ae96ffd3e58b90bdfbfa6a5e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised CMS uploads and disposable domains, indicating a link farm designed to distribute further malicious content. No scripts were extracted, but the presence of multiple compromised URLs suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://nigerseedindia.com/uploads/tezelaxezikagewazazi.pdf In PDF document text
    • http://silverk.ru/img/lib/file/melisamolubesoduxid.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379e97d89ca---dimux.pdfIn PDF document text
    • https://theipbuzz.com/images/file/67235177148.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210903180334.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336e505a620---75791238234.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/33afa1e8ba79600c02aaa4bec15003ef/81922783476.pdfIn PDF document text
    • http://imbirimbir.ru/files/lomogisuxowo.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b337c47a47---49293589277.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/dibixiveromopiwe.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/xafubifamugusowe.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/45812729402.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/79038073585.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/161344bfac729b---85339313520.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/wesesojejifimojug.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/98836531830.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/gibokomezefewekem.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/rokedakowafo.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/25391834765.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/89288170785.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/66573537629.pdfIn PDF document text
    • http://kapfenberger-schuetzenverein.at/userfiles/file/41449853055.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/92252165821.pdfIn PDF document text
    • http://stisk.com/file/44773190231.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/25817703423.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/damila.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/70113777064.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=push+and+pull+strategy+with+examplesPDF link annotation
    • 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_off0000df74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF74 16984 bytes
SHA-256: 578cf9655ceca5b746295d84dfd5f23e3701c463027c2abc8b55627abcd74ab3
font_01_sfnt_off00010b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B60 11124 bytes
SHA-256: 4305aa8fedbcacbad63950ba87ed38e847377cb11cfd81c046ceb929b60a3ed4
font_02_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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