Malicious PDF — malware analysis report

Static analysis result for SHA-256 15178fa4422a2e9c…

MALICIOUS

PDF

105.5 KB Created: 2021-07-17 16:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c517a90e062b1613e18ed14f4e2419bf SHA-1: 194dbb3c28444bf267b7cc9c1c303846f0b48d56 SHA-256: 15178fa4422a2e9c9b62daf83cbe5be3fd3629b472b7fa6662033ea7f0e03140
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, designed to redirect users to potentially malicious content. The document body is heavily obfuscated and unreadable, indicating it serves primarily as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://rockfordauburn1966.com/clients/8/85/8549db0cc7d1f63cce07d3be93bd6f3d/File/sewol.pdf In PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609973ed74028---wetutuxekumuvasudojaxate.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/ephemmjq07u643uvp3s8093d7s/58814184787.pdfIn PDF document text
    • https://anfauglir.com/images/file/satamifibadadukebofa.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/sazudebelovigomimifa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2b5a515a1b426e1981b36ae3f10bf4d5/89868363281.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/videsalaken.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/vomepizezukemamos.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/he80nvs7lc5rc2ga1vo0kmrq31/zufijabitoruxuxilize.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003685ac90---56280075933.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/kunosopulab.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/496831587b67a8eaed1b9fe97df2a9a3/36032930035.pdfIn PDF document text
    • http://crm333.com/documentos/file/85322293383.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/958b7ee69ef691f52f2aad4429e43d85/73973400247.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16070eb37d1509---gufefagubunenilogifovew.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02f7da06---vugafiliv.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f89508dcf2---budojafu.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160862a8f3fa27---sigewisaganev.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/dnh09tv139rbaviaf3mko9j882/firisuxanonamax.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/9903de64d00bdb98b8f296e60902ca33/91888692607.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/ib5eg7si94pmkc10qncdo69ua9/kaweremix.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/59f3553ed604db9b5f6dc72c860b9808/lutaxuwokigiwijiba.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7d3b40cfaab7f7caa680888d9427f0f9/fesedasuzubovawokinud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=reverse+cable+bicep+curlsPDF 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_off00013d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D25 10396 bytes
SHA-256: aad13658534c221996974b9497f83520462e007c588d82e976a8efc03ccc7e28
font_01_sfnt_off00015494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15494 16940 bytes
SHA-256: dc4e36fb2bc6eb2293fd06311a416bd71416fa177d114e6c72eb17d01bb7a118
font_02_sfnt_off000180b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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