Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b91d0be2ce939bf…

MALICIOUS

PDF

88.9 KB Created: 2021-08-02 06:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 485711af97ab059d1e403a7b260d34ce SHA-1: 34aa3f91746792087eda335f96cb110ed6295139 SHA-256: 9b91d0be2ce939bf15eb957a1c8e9724ee985f0340104b7653ffccd836548922
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute phishing content or further malware. The `utm_term` parameter in one URL indicates a potential attempt to track user acquisition, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=tamil+old+love+songs+zip+file+download
    • http://backkwang.com/userData/board/file/47414607291.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6cccfc8c---11295546361.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/125iskpfvr0nc10nk1o69iv19d/vujepekumometipudisin.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160786938bd519---68624604492.pdf
    • https://bdblue.com/ckfinder/userfiles/files/renorux.pdf
    • https://joebalogh.ro/imagini_ws/24884663949.pdf
    • http://perles-del-beya.com/userfiles/file/40128677598.pdf
    • http://painttechvina.com/webroot/img/files/13923584712.pdf
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/95323177422.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/2103f6acb342b49f2d0a4c9694a37aa1/33248266924.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e0e49bad4---2616430412.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c039de55e0acd16ca1b2f27c721fd5bb/97877083441.pdf
    • https://zohopinler.com/calisma2/files/uploads/60570600015.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0af464b9dd---pipoz.pdf
    • https://sjalikave.hu/pictures/file/1998862529.pdf
    • http://zerosquareonline.com/file/33004358445.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ab7a0fa4a---68169830686.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ad3b3c7020d2aa705ade9c4c19a8bf4e/54996286739.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cc61289b7---7989120779.pdf
    • http://wooshin.kr/uploaded/file/148307285560b109673f9ed.pdf
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/efb5b9f1af6be6171f3a09739435ee42/30870184840.pdf
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/89790122791.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1708817584ddbdf9fa2cb11a9c85b217/kiwil.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160712a575512e---75419994156.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c1c033d98d0ba236a2d0fce8d25b53c6/ruvasabimevomokofotep.pdf
    • http://brezov-gaj.si/uporabnik/file/zuripe.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f376e1789f0---fazafinakubi.pdf
    • https://samarpanbharat.org/trila/userfiles/file/folomiriw.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f66c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF66C 16792 bytes
font_01_sfnt_off00010e7e.bin
a4ab7932b78fd651822119da365a517ca1e5f9e61ce71409c8ce45fbfbab2ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 17188 bytes
font_02_sfnt_off00013bc6.bin
8953345bd315f0bd33cfc1b82630bb390e40a39073bb83d80300c2ec6ea30728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 10820 bytes

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