Malicious PDF — malware analysis report

Static analysis result for SHA-256 751bc13e8a80fb32…

MALICIOUS

PDF

93.5 KB Created: 2021-08-16 10:50:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34118aa65972e99b6ba7b3dca129821e SHA-1: b53fdb693e4135655f555f481d405c9020389693 SHA-256: 751bc13e8a80fb328d65fcacd686fd5a5ceb38a7062390e7538c95898141458e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a spearphishing attachment attack vector. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/2886888280d7c4845eb402a903431ce0/54582539171.pdf In PDF document text
    • http://goldenpoolandsauna.com/user_img/files/duduwo.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/a7e3837c56eb4115d9b97b726d081407/19240541740.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4db2fdae18---32300419499.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c28cf465---99012192698.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/nemorijisozagabigejugobip.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/robixirobitaja.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/62352668222.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i7bg57riaekhc273n65fhfsun1/tisorilofopeduwapovo.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/62030982885.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/subowizetaxanojetezim.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611136d199bcb---vowipofizivavonu.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/korabezamabunulowipozar.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/06324dc8001d5e3b3a453ff5b58e4a8d/kofunobevejorimijaxawatuv.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/lasisavojun.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/eoqoue62lukokcoijborck4r91/tokupuxozewetepulijino.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/ha0j1932nrr4r39oae4ar827n6/xejuvinuxanafixeruj.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/fezowojujikomuguruvaw.pdfIn PDF document text
    • http://banquat.com/userfiles/files/texad.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad18577c820---kerulatipelamagigun.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/9807051112.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/97068760851.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c2389d97519b61e564b1307f901d878c/24417174832.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=descargar+musica+rock+en+espa%C3%B1ol+de+los+80+y+90+megaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 11768 bytes
SHA-256: ec50e8063e3819778105626db311e67093ea5f38919d264549ab31b796a5bfda
font_01_sfnt_off000105fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FD 18336 bytes
SHA-256: b55077c4a02e8964d9fd33993433e87f7968ecda26650f16e08abd1d5d0952cd
font_02_sfnt_off000134d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D3 17004 bytes
SHA-256: 065f649f23a9310fa6640b29ac8c75c02901c7d82a5230c4d6ee0ff60a6431c0
font_03_sfnt_off00014c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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