Malicious PDF — malware analysis report

Static analysis result for SHA-256 516064b53b7fbb76…

MALICIOUS

PDF

85.6 KB Created: 2021-08-03 14:33:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b28761308b16835b91d87ca44df6345 SHA-1: 6b276e99bd7309e5e4ad93a7ef4fc9023c906437 SHA-256: 516064b53b7fbb76b2227049a8397653a27034ee60e1c03bec026d2e1ddc6301
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories. These links likely serve as a lure to download further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fcaab4a43---45620314002.pdf In PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/83603228501.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/fb8342ff3f9f4535adcb6d8de002d7fa/26813528896.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097cf0229a58---botanidokulezake.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/45582353766.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a3b4d4dcfdef66f62da6f75eecbeeda6/85878531241.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/vezojaxox.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/26188744552.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99cc43686a---ziforido.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/cc56dd6047df16e76ab158debaf5ce9e/33698824221.pdfIn PDF document text
    • http://aps-mes.com/files/file/nerijaxus.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/160784631633ab---27289897444.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/94641041778.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fe72ad0317b---pisixonufirogiw.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5f01hgo4ov5pitgl0qb4jnrbg1/19837535385.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/57906492427.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/39844168434.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/htcufgk287687jn7h13hd298b9/28800211383.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/13118602844.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/modiwoba.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/519473db470b7392e0ddbcbb6a00a531/24903748215.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/26525306078.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/tevugemorovexixoduwemilav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+calculate+the+number+of+atoms+in+a+molePDF link annotation
    • 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_off0000e969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE969 10916 bytes
SHA-256: 4067d8d87c27507f8a414ffdc127c2acfd7079c22a7be6c45838678d07929987
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8F 17268 bytes
SHA-256: eb035e512d8e01d49bc5dfcac36346eabfb75add3960ce70f9b88d58c5adf64f

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