Malicious PDF — malware analysis report

Static analysis result for SHA-256 17663c5a08629a85…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 11:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 356aef7d51acfc185c4117616425d022 SHA-1: 25b24ad93bbc43a8a5ac0764bd5b6117e8f07046 SHA-256: 17663c5a08629a854c5f1ea18e96ab5f1899c4fdbe7089f062ef10ea769f6483
164 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. The PDF contains numerous links pointing to compromised WordPress sites, suggesting it is part of a link farm designed to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the nature of the links and the 'link farm' heuristic strongly suggest a malicious workflow aimed at tricking users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347a8775833---bezazaraserobi.pdf In PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/5123736197.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4f34bcc9---79878957229.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609dcddc65d03---fimebenibulexuguzor.pdfIn PDF document text
    • http://rorolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/23015758911.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de1e0e797db---muxuramuke.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a0d1f2323---josirazut.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109050357569014.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/fofuxetewu.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cad7479bb---dapes.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/11602971800.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/surazezezevubugitijufub.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/se39ni7fuacro2tgm0vngcc094/vimuwuredusozanenegazim.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8a61bdcf---93684588816.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/1817134313.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/fidozuramixiga.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/velenerujo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/qut5e104blhla0fvenfoim1ca0/zogezopawegixot.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sejebikutidunulob.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac735894e01---bevuwonenimovowavugegiwu.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/tobapigemisoxomegoza.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/kuzafolafozafi.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/30624889059.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/dewitekosumevojuzulowe.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/gipikowaluvasajifi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/bc240293aebedd68cf313cd2a1c0568b/34096032124.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/notavibuxojexejubefa.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/xivimiwokibamovogobeka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=criticism+of+contrastive+analysis+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_off0000ee71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE71 17132 bytes
SHA-256: dcc1411c268979d814c07268c7847f976bcd8f92b3b05201ce224b7990d7ec2a
font_01_sfnt_off00011af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF8 10992 bytes
SHA-256: 0c87ad9c242fdd5adabed5da549f8b6b5927e5feee260040806e6938b1420e8b
font_02_sfnt_off00013492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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