Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d2d771e4bda0b7d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 13:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f0126f40157a79913b8ef5e0521e1ee SHA-1: eadd03b2ba4472560239e71c23cc2ce2c710f7f7 SHA-256: 4d2d771e4bda0b7d02114f90b93eb8d4bb46abe29ec5e929212caa411d337f81
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into downloading further malicious content. The presence of compromised CMS upload links suggests an attempt to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://fmmvn.net/userfiles/files/81630262248.pdf In PDF document text
    • http://macautemple.com/userfiles/file/29683091128.pdfIn PDF document text
    • https://emenu.hu/editor_up/75000112141.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613092f4f02b1---92722494887.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1623196152pajizozilixutela.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160893d7a9476f---nokamuxa.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c3a0694d---4687998314.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/m63uanp47ea54tqshfqolbrmce/siloritolaniv.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/tebulap.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/darajevuwilanuk.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/d8ab618b5ddc2e7cb42f96fa64dd4b86/99197069561.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/082018032518.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/32758400049.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1abe7ff6936d55888fa55df0afa5a1c8/66178262313.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/94364358085.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608be7f36fcd5---jupasajeziduvagezonadu.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/zunamagazuwagigunojitem.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb62f33e8---mibobajujemezuwe.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/pawositilamuwuwiga.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ar7g6269geho1sk19to48qlr9f/gonukawunilosipug.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/mg3ibip6vickqv57dvhqpdf043/fozejawitogugesazud.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/14e7c020991bc6b839291d7fc6a7bb3d/kobupunabakupepujan.pdfIn PDF document text
    • http://gyorszol.hu/userfiles/file/romimulisobojeja.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b002e42eb8296b14ce448e36cdcde2a5/nurulisoremetusede.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bank+syllabus+2018+pdf+downloadPDF 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_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 19400 bytes
SHA-256: 5ed29bb29055844517143da13e69eee65d68254cf505ed7c0f2242f76e8fb6e3
font_01_sfnt_off000103e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E4 11156 bytes
SHA-256: fdb360147918cdf02d5481a4f5572aa636f92f925494b4fa65440eb166d84b50
font_02_sfnt_off00011e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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