Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f954b3606498382…

MALICIOUS

PDF

78.5 KB Created: 2021-08-30 02:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7e969643f7591d13dff0a3cd2f360f89 SHA-1: 3682735dfd66016de57f5d2039db25c373416bc0 SHA-256: 5f954b360649838275e695e5ed7c197faa67624e148c046dd6b20e63d0386a38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate this file is likely part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://chcial.ru/uplcv?utm_term=abigail+the+crucible+character+analysis PDF link annotation
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f9763110610---govoninesalit.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2203c79cf---nojovigebe.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/vibilaregagiruvepa.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a68482a41---zimek.pdfIn PDF document text
    • http://puebloexec.com/userfiles/file/11430608504.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/693dc9fb90288acc51f3a57bd251a564/93083025717.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/93537047659.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/raboranaziromadaroget.pdfIn PDF document text
    • http://www.bash.cl/media/file/povuxerebakineganakerofo.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/nipuxezuretijopawojinedis.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/77927922596.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/22497959911.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16072765b7d6e8---latatu.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/04b70bd6bc28ccc70feaa232247ccd6f/60628008108.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/26741288970.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54235af42---36101315679.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160925704cda0c---sasadifaburarim.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/80486213898.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/notixoluduxonupukasukivag.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/nusifiborezetani.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/tulosoveture.pdfIn PDF document text
    • https://corpus.bg/files/fck/file/zejorazan.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/b3c3c5289ca8565fe5846c4a9ecc0c0f/wuwizojitexutuku.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/39503316789.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/bsgl5mul4fev37qk26fdr0677e/visefotif.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/rijubeneweso.pdfIn PDF document text
    • 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_off0000cfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDF 10724 bytes
SHA-256: 5c15ef15080b06ceadb229cde29c10866e66cdc24a776ef1fec09052dea98411
font_01_sfnt_off0000e883.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE883 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10095 16916 bytes
SHA-256: 197d4185d7477509a2283460c4efff36b7c0586787eb05a2fa3767ee3d17c9f6

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