Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cdc09b750377e47…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 01:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7591ff39a60e4c824af0b3a7e67d7248 SHA-1: eaf8a26d109f406c7eb3f1370756e09d56322a1c SHA-256: 1cdc09b750377e471a24fe45f1b170abeec69c89d81b1da4025b3b0f9e1ad4d4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to various compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of 'download' phrases and urgency lures indicates an attempt to trick the user into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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 https://nomylo.ru/uplcv?utm_term=student+of+the+year+2+full+movie+english+subtitles PDF link annotation
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e348eb86302add68fc6d6da83947ca18/95961430193.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecc17eef5---88528518844.pdfIn PDF document text
    • http://haus-st-otmar.ch/userfiles/files/58163015556.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/76904480212.pdfIn PDF document text
    • http://prosquash.by/data/vukidisapibewugazuv.pdfIn PDF document text
    • http://armanetti.com/images/zifigawofonanijawok.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/7e88aa02d24d7b3a6b7e550fcb978c14/4237462965.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b869726538---ridolif.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/15789512163.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5396b578b---mefokodawijepiput.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6ad9b90a7---89110896324.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/wizikujobez.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/n7cc0u3tnavc38rfv5h3ol0ad3/nizefafadevedufuz.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb5ab3552b---gepukale.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/90626400275.pdfIn PDF document text
    • http://rafaelokazakov.com/file/jorunetorebisoso.pdfIn PDF document text
    • http://sam-global.ch/files/file/vuvujugopogobik.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11a691302---bakime.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/18203320999.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae72d2a0b6---bareloleramuripajasi.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/bb2c1cc3103b11b7654cbbfdbc8fa720/noxobinetowigipijo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/d772abae9dd45508f7c54c9db4090438/29221878390.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/0e3f6756e28146d574b6b557323f4089/tedetekuvalimizunakowelig.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/pedigozasotaxi.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_off0000e9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 11416 bytes
SHA-256: 8decbbcda18045dbb7b79a5a8a6e5f9a189bc74f9d73a5a6b56206da3951b199
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 18236 bytes
SHA-256: 9df90ccfe625ad8cb63b75a892e945b2d0cf7eb004de4f5441f9e5eaea0c0d47
font_02_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1