Malicious PDF — malware analysis report

Static analysis result for SHA-256 f090a21650d3f9db…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 14:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d4e532d5fd991ddb0ec860e253ad3a7c SHA-1: ac166da2e76ccaf2ebcb3c89daba49d1a0368b9a SHA-256: f090a21650d3f9dbf0ff102333389a2d6324e6b267da6426c183b64858e08eb3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs that point to compromised websites and 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 distribute malware or conduct phishing attacks. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://pixomot.ru/uplcv?utm_term=dns+and+dhcp+interview+questions+and+answers+pdf PDF link annotation
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851f11b4e5d---kunuwepekizoturibefute.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/kuvukep.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/gs48qb5bfjpgqgqmtu0q4p3lb3/81475835441.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/10426586442.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/dd3450b4eed65e08b40e815f7a00120a/jenovobojidonesonobaz.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f8e5a302---10449909772.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161161e10c20be---defajufufajofometumit.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/25828378604.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/58627690166.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/10559044050.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/96678162613.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/dazubowudikumiwifano.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/20766381274.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de570586e5---sexagawaruwuvozudaxe.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/bibidamodepotufo.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/defobegotuxeberudupewinod.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/14405291208.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/75465398069.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/96576478046.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b63a6aebb07---22173464251.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210628050441_NjQ0NTc5MjA0NzM=.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/76844391117.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_off0000e283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE283 17452 bytes
SHA-256: 87e3b814e2ef07c3fc9dd461b23ba6983e3f4ca47d193e6d5222d82907834136
font_01_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B2 11072 bytes
SHA-256: 6043ba1d89805558a7b0ba0c3c7c425b91a40f3e2bc878151f96b9b89b190cca

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