Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b92032eab015fc3…

MALICIOUS

PDF

77.8 KB Created: 2021-09-15 11:27:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3e6f7cd1692d920cc9516405c6c392f SHA-1: 8aad2ceb0754c45daea45445b80648adc15921b2 SHA-256: 6b92032eab015fc374f0b5b9ece70abf4ce1d6dc8feae3346a0c17286cbaa84f
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=lock+screen+wallpaper+apk+download PDF link annotation
    • http://pekingtogo.com/uploads/files/bogamomojefupijuru.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/jumoburotixiv.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/39901080024.pdfIn PDF document text
    • http://hiniceshine.com/upload/femebided.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/nuxifutunidifod.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/66712301243.pdfIn PDF document text
    • http://trevorhannant.com/zoperizawiwefo.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/95193406599.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/levaku.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/titimawolemopemu.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/23258780521.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/kanakezonu.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/89c534007bb288e8de5c2a163b733d0c/1580918891.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd8ec5c60b---90530650507.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/78429676920.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/96331354370.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161346f40d072c---jolowoxedajevi.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/84745023756.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/63103839340.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141459209a2f---vetejilaninafej.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/visofeledota.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fc512f3b---55840830360.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/16175855907.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/diwizonopudedafedeled.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_off0000cc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC07 17292 bytes
SHA-256: d253e7fd8f0e1559f56ede7bd9f9a2d92860c40468c2a751a7dee534d4b72943
font_01_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11135 10452 bytes
SHA-256: d2afb71718167b4d98eb7de63c4fcc1b2dafdb249f6d3085279e42eb4f11ce00

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