Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cacddeacd1bce9e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-16 04:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 29e890d426bdbe61280cf56ee0c802c7 SHA-1: 9567baa8002a881570e5b7149dfdfa559d10e750 SHA-256: 1cacddeacd1bce9e99850a89a8616b36c99c456a2fd66ef1b26c606a33151438
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 functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an intent to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://oniceh.ru/uplcv?utm_term=general+zero+hour+for+android PDF link annotation
    • https://delphin-restaurant.com/ckfinder/upload/files/27494958306.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/1124473099.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/81963075920.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/b535a14cbf8ff3121f20f4e9cf8b0d1e/44274173993.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/99848499789.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/213qqfhgmnhul01asqc7ool730/10949545378.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/xivedomimiseji.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lomewapilipaviliguje.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/jupesuw.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/jupifufekunilomuxufu.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/19765775030.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/nexevenepesakerokov.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d53ca14f64---jenugetosutu.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/32761003951.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d407929a3b---vinegivofalaponusogetasan.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7a5f56e67---revategijopon.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613624510b5c8---davonunanuje.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/zusekiweralegofemen.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090812495211.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/xujidudidesigu.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/nogemam.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/51941247168.pdfIn PDF document text
    • http://lenosada.sk/editor_uploads/files/venibumuzexot.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/sugex.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbb48b1183---70420015052.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/tuvivixuroluref.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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 16288 bytes
SHA-256: dbb0495f3c274f118e8b8beb999a256bc4d0aacf7b0dfd1c8da7c993e1e2d394
font_01_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B2 10384 bytes
SHA-256: efe4426d94937a2df082043dad5b06324ff2c4d7ac9a2545e267acbbfdfbde91

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