Malicious PDF — malware analysis report

Static analysis result for SHA-256 a010c2d879c66a1f…

MALICIOUS

PDF

93.9 KB Created: 2021-06-29 12:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7515d4e69cedf6c96d84255355a96c8a SHA-1: 554a70252194fda50f5dd2b9904a44897f059bed SHA-256: a010c2d879c66a1f6893d715c3145d0852e54e0f411a7bda6ba22e01582b4e9c
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, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://allytemp.ru/uplcv?utm_term=brave+and+beautiful+episode+56 PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/d523bc656f85a50ab122e8f367e61b2f/podekadiguwexekabeso.pdfIn PDF document text
    • http://takemehometomatoes.com/ckfinder/userfiles/files/taxurejov.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6e267f0d5ee87571c47f6eadb84f8793/59990133580.pdfIn PDF document text
    • http://hkalc.com/userfiles/najagazofife.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/66568556770.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b078124ca9a---kuganamebivavapulixirux.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/b24lj4jvvj41g3im6i0gchnubr/39649709730.pdfIn PDF document text
    • https://susta.vn/userfiles/file/39011607503.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/nodovo.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/54004411653.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/40427174546.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/3187067952.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e7cdfa7f---42181465672.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89881544d5---69246189388.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/c78e1e306d480c64e86183be81fd34bc/55308474743.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/fudafugiluvivaxeviz.pdfIn PDF document text
    • http://argyler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cc9e7b4fc---fiburatesegukukajaj.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/a5bb4d4aa62672be702a81209feaf6e7/suxuzobatojutiruta.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee3951d370---natugafozazolojesopafise.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/b38q28hd05q2qrg4jgignkrqjj/vuvupiwuwemusuwafu.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607265e8db720---25833170359.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/8e8d80f4b9465aaa83b7ce01f4aa8a51/tefabiwudu.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02f02d744f---bekewimitejogaw.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99aad2a96---90506392739.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC59 3912 bytes
SHA-256: 3954c317ba8e4d885f182befe00a38f990e465a8b3dae819b19e876fe5253c52
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 11152 bytes
SHA-256: de4e45904bd33cc169028d5845421ff072397f4485a7bf95ff585abf79edeb37
font_03_sfnt_off00013d27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D27 17600 bytes
SHA-256: 5afd0011b2aacb1d41aba27cbf3fdcf14fd8ac7448d2ef6edb35aaa9a9390aae

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