Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd06e4f0ac685d2…

MALICIOUS

PDF

92.9 KB Created: 2021-09-08 19:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6bfdefc1796e22180e1b5a28f2fce66b SHA-1: e4c6406bbfcea6b66619d46d912b8e2c05ca6748 SHA-256: cbd06e4f0ac685d2695c39587e96fdbda035f46233c8f5dbb241c01b7cb7293d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/pdled2oi916edmfeh83chlvce1/21768813671.pdf In PDF document text
    • https://paperland.bg/uploads/file/50818435093.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090423362480554.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/061753492101.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/vidavok.pdfIn PDF document text
    • https://euchebnici.com/img/file/nitivoxopofan.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/lizukazal.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/92986413826.pdfIn PDF document text
    • http://canadianrockies.info/files/file/zivozesalef.pdfIn PDF document text
    • https://conrays.ru/f/data/xumavoxesenawinixowape.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210904045058.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16131ee0ad293c---pofebisorukeso.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/ralugosefiboliwi.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/21452028858.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/zupap.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/nisesotagelugir.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/51331003830.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/24708883571.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/posanekikidorejizerubiz.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/jaxute.pdfIn PDF document text
    • http://www.startbatteries.gr/ckeditor/ckfinder/userfiles/files/65510471499.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/fumumubesujoxapivefilur.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/botuledorijixulemoma.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613364b77efc8---95572999694.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/jomav.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/19146898114.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=fujifilm+instax+mini+8+manual+pdfPDF 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_off0000f913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF913 10824 bytes
SHA-256: 73d17f2539536feea98dfe92bf95ec1bfc01591aaae410a6c5c83a9b9d299d69
font_01_sfnt_off000111f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 23408 bytes
SHA-256: 195c1852e75813d42c302da3229ababc1ab4dedda3443e311746ece5ca536010
font_02_sfnt_off00014de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1