Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde292311fb74db3…

MALICIOUS

PDF

102.0 KB Created: 2021-08-04 13:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 607dfa85e7aaa89006936f60471f7611 SHA-1: a1759980c8525651e9e4e521e4e04d9d1acc56ad SHA-256: fde292311fb74db35fc2b347858ffe1062784064f5aabac870086a0bf22178af
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS upload directories, suggesting a link farm or redirection mechanism for phishing or malware delivery. The PDF structure and embedded links are consistent with techniques used to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939963c3149---govapesoravawon.pdf In PDF document text
    • https://svingenieria.cl/userfiles/file/78373755231.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-8-2/20210802064951461830.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/a21de52339cbfb6b09bbfc1141a67c9c/68721629140.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/187128990.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/un1gi93odkdmf5fksch71bh365/selotipofuvije.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/235f179d5f639cece8340b0d45b06deb/kakunajoruku.pdfIn PDF document text
    • http://wwstationery.com/files/file/17884846681.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f4df43719---dusorozuzukoxewewomeferu.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/e2ba8861be2ad7e8565ebd7a560e6a51/xapiwasab.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/osbuhs0a10fed4m2mjo1airhjf/kerewedubigapojovo.pdfIn PDF document text
    • http://keacg.com/upload/files/88009962881.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/25669764493.pdfIn PDF document text
    • https://doublehaircenter.com/upload/ckfinder/files/miluropujexixemitajo.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3335206ec---67125621555.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/9104375578.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/obdvme032s5rej76s226s03j70/fojinadavazurujelemilew.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/15621236270.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/11703757686.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/i33gas7vdcs54pdpsn30jjphi7/48379312321.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xitezatizaziluvevuwopaxa.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/80057918301.pdfIn PDF document text
    • http://ekotronic.eu/files/file/43560373177.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/18514524924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=break+even+analysis+in+cost+accounting+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_off000129d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000141ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141EC 11220 bytes
SHA-256: 986276b3f8e1cd33cd1532ac6a796cb9857d2078d30390514e13bb25a3574320
font_02_sfnt_off00015c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C34 17328 bytes
SHA-256: 03866a4d18dd04e1a98ba19f6b988a9f9a56295616551f4ccc97159871e4ad95

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