Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e990f87536a352…

MALICIOUS

PDF

86.4 KB Created: 2021-07-13 02:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a829a91795fe35c3ae72b8c8b3f32c53 SHA-1: a2ceb88a208a0af128343fd31f3356c1dfe32b63 SHA-256: c5e990f87536a352c3e02c12a1f37ceff05f9a805a7998124bb5fe6aad485395
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting it's used to distribute phishing content or second-stage malware. The presence of multiple external URIs and link farm indicators strongly supports its role in directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://inwebjor.ru/uplcv?utm_term=insolvency+and+bankruptcy+code+bare+act+2020 PDF link annotation
    • https://heatingboiler.ca/fck_upload/file/pirapoxatezodap.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/fedexovoxakegobituj.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/40f2459df0b7885023174d78ffcbad3d/zebubeberozoxofodekiwuf.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/vuzotalowuweguge.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/72824256169.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/girumuluxefapodifo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac619e81dd3---81313460016.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/gaxekujodiniretadelor.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fe5b8c6de28b92bc6576e67e700847ab/xuwobeb.pdfIn PDF document text
    • http://kup-vino.cz/web/ckfinder/userfiles/files/dewajoxe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072e69a39aed---wigubebulubawogumuso.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/tozetekufarowavi.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce131b6969---lasegav.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/7210192738.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a642eb81---67764075534.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3e618162e---46252869835.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/17530862425.pdfIn PDF document text
    • http://indianaquesters.org/clients/9/95/9573c8d6e108c9729a37356986dd5b5e/File/lekovoworakivolevezimuw.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/850a2eaf2cfcff4ce307a280bd1f19c1/zovezilugelov.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/nimog.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16078616225c02---56950575993.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160893994d08b9---35392566175.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/dalosozubevotolixoguzir.pdfIn PDF document text
    • http://simonide.org/userfiles/file/fakitazurabe.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wexakenula.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72E 19500 bytes
SHA-256: 030d71665fc1eaf32532f694b040f10682495735c72e85facca50ad40f5b0874
font_01_sfnt_off000119b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B2 11120 bytes
SHA-256: e75a64adb5ef74572f55cdc6eca28cc0b3545009ce2d1b292cfdd3cfe59bf7a4
font_02_sfnt_off000133b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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