Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfd6cadae4ea96c0…

MALICIOUS

PDF

93.0 KB Created: 2021-06-27 21:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a13b27076c95b5d79dd6effdfbfcae44 SHA-1: b21bdd871ff764b487f9f3001f8127b39b7aa67e SHA-256: cfd6cadae4ea96c0e131c6dcbae5a2250c35fc54eaf5c8473fb73fd39f1e8fa3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=how+to+answer+where+do+you+see+yourself+in+5+years+time PDF link annotation
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/8o8th24i01c3hcsih4jvqtoo83/bagunebunubozimututexu.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894a50e4c81---lugotofuzulijeno.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2e9e06548dae15d189bd93add6205ba3/wiwomakofewinuwadel.pdfIn PDF document text
    • https://ewastexperts.com/userfiles/files/guwesa.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/89a2bd43e6e08bb831e3b5cc41a3220d/75926460876.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/08975f76593ec78d13f82f2da4f2f264/99723867686.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c869cf0b508---fufefugapirimivosazix.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/jpnm63li0bqt4khqb1usjhcmqr/39354330182.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860222a9cce---fagusizarikib.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/mudorokenadakumure.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fde71c831f---weberokirivapesufilap.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e56236c1f---64849003153.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f292c2a8e20c07cd4495e3185cb0c9d/datusosamowabumijo.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e98e8e387064d9f09c79ae6c45bb9de2/51421081920.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/14798626352.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/90655d2d8c7c6cf62ba1082b35d749d5/34619001183.pdfIn PDF document text
    • https://medtek.vn/storage/file/68135532994.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a361ffc3307---zewuvuguxinojusevad.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff47225689---nuxofusutubi.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7ae938175---vojisugi.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e30f219b01aa8624ac9e7af34bea08b9/bexolororowigujitatuvu.pdfIn PDF document text
    • http://hevolta.com/upload/file/67020393983.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/e1af3e10388cb09837de3763b95ba734/xamubexazefopiwevagar.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba86933dce---35539246360.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/7806bb233cc2229c0cb906fcbea7098d/92580234298.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/53786524939.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c95466848e7d5515b6f4c4e5e82b062b/70644405910.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_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 17192 bytes
SHA-256: b038883c0548bd829a799efaf756ed3eb7d31786e339e9f115c2cb7a17642634
font_01_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB5 11044 bytes
SHA-256: 72c5ff0752339046f4b8fd4e2866e233b09cabff27cb88d2752307a358bd667e

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