Malicious PDF — malware analysis report

Static analysis result for SHA-256 099b7b97dd2a648e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-06 15:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5438f2e00ab657651bc274d7876cdbf3 SHA-1: 1049b3cc7797d6be38aadca4a2ae69eb48643db6 SHA-256: 099b7b97dd2a648ee56e30d53d1defc3ed8ce1bcd287d7c52903dc29199178d8
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://huntic.ru/uplcv?utm_term=salus+thermostat+rt310tx+manual PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d089fc85f3---vitulozewilovinuxelimuvet.pdfIn PDF document text
    • http://net-marketing.hu/images/files/wizazetipesovidekujotene.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/20661302281.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/90301cb76e7050902b766ecf3497c559/roxelafapikowu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947b3d83903---fotebeximufokipogir.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7bb33381c5---lebifewirakavawidoda.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/al138hc8lbmqsbtvrb6jhmmc27/pegajameb.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/25092566242.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/75975485886.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/80467085594.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/pisezemozu.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/99cb47a6fe3b3c3ed28e7ef9c322e772/60187517934.pdfIn PDF document text
    • http://keemunblacktea.cn/uploads/file/021042505672.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a003e91c7---jivugaluvajojilopezojuw.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/babiwimodoxitit.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a114667cab---likukumesebi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4421be1e84b5006e849088800137903a/56139333930.pdfIn PDF document text
    • https://olterus.net/contents//files/sejovoxosowavonipelebodal.pdfIn PDF document text
    • http://bibikid.ru/upload/zozabulopaxolusajodilag.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610446fc3d40a---53587646682.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/19186198458.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160756952d3890---jevejezifowukavetelod.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/gojuzoluvexenurukilubivit.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_off0000b63f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB63F 14656 bytes
SHA-256: 8b777d57935880f87ce9de406d6eb887078ae5c00a92ade68fe04abd814f3b6c
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 10904 bytes
SHA-256: 6a4b6018e16b49d9a45307c75439fb6ae6c13d56fa7c2a4716e4eaec694a6a73

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