Malicious PDF — malware analysis report

Static analysis result for SHA-256 90ef3efa21b40745…

MALICIOUS

PDF

78.1 KB Created: 2021-09-02 03:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24ace38d90c98dc69a485db6a4240b6f SHA-1: f2482b15095cefacab18559c3c957aa7c8b93120 SHA-256: 90ef3efa21b407457922e31d32f5027b1d1cf9a9f809e88892429d55fe4b76a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of multiple external URIs and link farms points towards an attempt to manipulate search engine results or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.fonfe.com/uploads/files/66373973609.pdf In PDF document text
    • http://birnagarcollege.in/userfiles/file/wekabirakizasokoron.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/kijipazududabimeji.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/gkqjuhdvjkrdrsg4s7hiv0fq75/jorisupigijomoraxuxuga.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/2113981852.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rqjoaidqbn3jera5fp1r2qi7q6/50700846095.pdfIn PDF document text
    • http://amandamaitland.com/images/file/81378332948.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/17228634847.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/ebet.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607071613fca2---36600034137.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/b54fb5e39479f7784beac014a1fa5b35/74402782016.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e39229777---74907291068.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vuleduvo.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/17030995205.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/81d21c2b6432f738a978127e17b61a99/89620872615.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce880857366---ketebebimomasulorib.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/99798501923.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/5f9ccdbb8764045a9984164b78ba4c4b/lojasisoruwok.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/18560148305.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da1a9be3cb2---radite.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/77972287798.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/13713682013.pdfIn PDF document text
    • http://apsons.eu/files/file/tofugipudimevokatozisepa.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5cb49706---tipufapej.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/f705dd900ce824ae8c89677d0f4181a0/xadilimogisikeweviwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bagel+recipe+with+self+rising+flourPDF 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_off0000cb75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB75 17744 bytes
SHA-256: 3f04127060cfebdd489ba526a9becf5082e5ff4081ca926dfeb3f9da0ac11d5b
font_01_sfnt_off0000f970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF970 10996 bytes
SHA-256: 101f6213db67198be4c2584439043764a1d59c11e89c649c29861b1a29e88c9f
font_02_sfnt_off00011308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11308 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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