Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0493ab93b004ce0…

MALICIOUS

PDF

75.7 KB Created: 2021-10-01 05:34:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04d8c5266ca41505fbe31f0ee0acd89f SHA-1: d8d53c98a88d4f378c64b81d0ca381ca13ccc819 SHA-256: f0493ab93b004ce08ca90f543f489a9d3159ab3cda78bf0394ef8c0ea26ee3ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of link farms hosted on disposable or compromised domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports that this document is designed to redirect users to 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://synerhu.ru/uplcv?utm_term=las+apps+mas+raras+para+android PDF link annotation
    • http://gniortho.com/files/Upload/file/76932549534.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/21166728222.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///89146989462.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/3686427afbbe050de82b0071546cc2d0/jejosoxejenavose.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/4650825772.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/63250329600.pdfIn PDF document text
    • https://babamansurkurhuseyin.com/uni/yuklemeler/file/7817699617.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/66286784221.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307c998ccac---simotukub.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/lutamusama.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/guwekakojatulukukodigobix.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/fatinejeju.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/zirokurudodelin.pdfIn PDF document text
    • https://sinaia-vik.com/admin/fckeditor/editor/filemanager/connectors/php/file/74360448824.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/fd46f5638f646c6d847877cfd6f6c330/89145361783.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/43717763650.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210902052217.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5a7dea5ec---95671044341.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/wadixugorufugekokagusuriz.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/wuvuxizapejilulefovuxel.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/tejizajesujulewodif.pdfIn PDF document text
    • http://sowaprojekt.pl/files/file/veludefubo.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/98881982938.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/29681969639.pdfIn PDF document text
    • http://tumakuruvoice.com/tumkurvoice/ckeditor/ckfinder/userfiles/files/81222980944.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/dalugezoduvelogigubuxiguz.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_off0000c05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 10236 bytes
SHA-256: a9dc3afd27f46d2effe6f1759ab04bff06e5de85e69b5fe2dcb6f2775c3c89ec
font_02_sfnt_off0000ef46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF46 19432 bytes
SHA-256: 290908ce747771d68f48648fe61aa6c59f1efaae28d63dcfc1cce5f64302e1ac

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