Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8f8025e24f2e55…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 23:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4a90e7bdc4ebbef17c0984a5ce48e089 SHA-1: 17b41bc428c68be3f1f379fc5472387ba37fb67d SHA-256: 0b8f8025e24f2e558e4b46ae0c2384060cbb8be1bd995510d80e4d0a68a0e609
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features heuristics indicating a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/powojawivulimulido.pdf In PDF document text
    • http://goang-hann.com/uploads/files/202109020635312785.pdfIn PDF document text
    • https://ka-base.no/images_students/files/53935117301.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/31732755230.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/47648192261.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/5600a9e6728e9610b840802f7a5baed2/rusuxawodekito.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/63725528043.pdfIn PDF document text
    • http://pfmconsulting.org/survey/userfiles/files/85900065660.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/zafarujoxojapotitojok.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name/files/68631285291.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/gikugokimedomov.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/gifewet.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/40526786065.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f45f3c3bc---zujagazofonuj.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/femunipubune.pdfIn PDF document text
    • https://babycloud.ro/app/webroot/files/userfiles/files/62889345443.pdfIn PDF document text
    • http://ux-school.ru/files/files/97302016241.pdfIn PDF document text
    • http://gartenstadt-apotheke.com/userfiles/file/29608485091.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/18354265610.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/76628540871.pdfIn PDF document text
    • http://123dvere.sk/files/file/dedixifowewetiliwotetewi.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/cdmq17t9v7644mopfnn7u6vu00/40120934794.pdfIn PDF document text
    • http://celeb.huh.hu/UserFiles/File/ziraloxejasakakezodatanek.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613438cc982c8---gasogudikelumopoxof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chasing+after+you+lyrics+vashawn+mitchellPDF 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_off0000bb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 17524 bytes
SHA-256: f1e69d1dbbd95764b81d72537d7c997689f00458d1ed64ccc81bdf2bc5425911
font_02_sfnt_off00010116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10116 11180 bytes
SHA-256: 4d75b78d3f7f966a1bf6c751df8938ac1fe82f1f917977ac3d2b6db07ebe1130

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