Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bca4d18d4314f30…

MALICIOUS

PDF

156.7 KB Created: 2021-09-07 14:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: afd469a7e3f9d64432d8958bbbfb1ea1 SHA-1: 4d71dd08dd28654bcf9998d3ae8381af2b5d2780 SHA-256: 2bca4d18d4314f3008e089eb40b38cd10b7a159724829d18d3dc5a99a759606d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to distribute malicious content or engage in SEO poisoning. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://effektfilm.de/files/file/nopuposimidelosegowuj.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161114eab2155a---68548111499.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/38942933356.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aec018d0eb---wometujo.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/s1gtrdd846uubqdlko3l5obhnv/demowavajam.pdfIn PDF document text
    • https://fptica.ru/images/file/manajijav.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/5530833969.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608be5c3a3dad---6893476790.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/45189717700.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/98631894332.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/bdab7f566a84c3cfd355a41a4a9123b2/42035692231.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/80ce4fe1a8855aa6e404d2c73d6bbf9a/34375476753.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cae7e8816---34270928642.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/78276179033.pdfIn PDF document text
    • https://promise-land.com/upload/file/67150962580.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/bigamuluboxulawijegonuber.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/35945908557.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/xuvemukaverigapunuseze.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/01ab9279ebb4f1ccbc5e117021e13372/tutujekakimepakedukiseru.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/leserezewolavamegipota.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/gewano.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609544c957812---tavedadisoritotepuxem.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/63cbe27b8dd2295a24585415841a3c63/39007213488.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/xijokuxebezasonabijato.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/tubuvos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=kerala+municipality+building+rules+1999+pdfPDF 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_off00020199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20199 11408 bytes
SHA-256: e08b15721f3c6b906b0567e70c0a3a805d10ba97343d51d0203428a70041a899
font_01_sfnt_off00021c1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21C1D 18860 bytes
SHA-256: 554475f449714aa8283e4fd2b6e4cc4e676945d59d0c1c454258131e1e1ec4cf
font_02_sfnt_off00024cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24CB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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