Malicious PDF — malware analysis report

Static analysis result for SHA-256 68544cc1a5357c8f…

MALICIOUS

PDF

85.0 KB Created: 2021-06-27 18:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5a2a63ba0d57ecca0956a68118234d1 SHA-1: 093aa91ef8f8b1a84894c2d50dd0f7986c089227 SHA-256: 68544cc1a5357c8f63f1f5bd1ddf028de9d00a14df68dce69b6a73a583c7baa8
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. These links likely serve to redirect users to malicious content or facilitate SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ecqf8in4b6ug0ojjd6evj85jk1/sisowutuzafaxab.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3d18f319b1c3c84946767ff32afde31c/doxadodogavifose.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/513350aad9bca506a7fb925482120d69/93555258866.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/c48bacbc996e1a3f9e6ad7cd0cdae778/91042369313.pdf
    • https://cristalparkhotel.com/ckfinder/userfiles/files/merovudoxujetusaxo.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4aa100cf3c95ef6d90525203853d9347/vonaxisolivarepowazeliruf.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965503d8859---76712547632.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e5741d92d---93951392621.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gvamm5gbqcrn8pt5c9584h93oa/74838550254.pdf
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8b34db60e---xobiwebulafevuzufetotizu.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/542513f73044cd895a3c7f952d8c4691/91597578694.pdf
    • http://botosani.ro/img/uploads/file/kojuwiguronawal.pdf
    • http://cuatudongsaigon.vn/uploads/files/35089560260.pdf
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/842010040acf8cddc100f0e50fab8f5b/kujujegojuridi.pdf
    • https://bbpartner.cz/userfiles/file/sekumovavawiwebisoxu.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2100f3e3---fopilapuxelutesulitupepoz.pdf
    • https://adsbudget.net/userfiles/file/mokubinusajiriga.pdf
    • http://www.look4job.gr/images/_user_na/file/bejimogawijona.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8f252cbf51c1937da12daa66ec586a48/96258766438.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609251bd7ca32---64645591027.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607739e172171---bapotevuwogup.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808bd50bcd9---40262890668.pdf
    • http://auapp.ch/userfiles/files/gawusodiroxagapifogoremiz.pdf
    • http://eska-lift.ru/userfiles/file/55535281705.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=group+theory+in+mathematics
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/667d4433c23bd25cfe3cbdfd9f7cb6a2/42449483587.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_off0000eaad.bin
332de3b5e75b94d8ca6bb476e83c544ec11fd9305bc5d20c2b03fa26d3da6c5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAD 16572 bytes
font_01_sfnt_off00011592.bin
9500c0283bbddb57a72587877477635771c6aa5cd3b20f25c434709077802c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11592 10844 bytes
font_02_sfnt_off00012e85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16792 bytes

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