Malicious PDF — malware analysis report

Static analysis result for SHA-256 814e354c176cac62…

MALICIOUS

PDF

82.3 KB Created: 2021-09-05 02:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4969408ecc8a5dc315afa519b39314ed SHA-1: 21d3e0957cd9ea7354395ce04792fab1eae20c60 SHA-256: 814e354c176cac62edbd23f81676f805b9ebde12a9d52cd5085f9a736614570b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of techniques used to redirect users to malicious sites, likely initiated via spearphishing.

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://www.musicboxpiano.com/contentfiles/59743444602.pdf In PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/tekegorabexelatikonopapuj.pdfIn PDF document text
    • http://sunjewelsonline.com/userfiles/file/kagazop.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/21728363953.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b62f218e0---28083213385.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/841c1697d851c7ea0953fbd68b9a3e72/mawupovowimutubexoxifut.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160783cd8a8b84---40664274423.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/868463569.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/148963510560d221ca009a9.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/88801705434.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/vokofusujonof.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/lelokidexu.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/31141626653.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/43034772824.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/vesikixab.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6153700e4e---50480849034.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-5/20210505203452150197.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/babarutota.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/75718178740.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/f8938041a79e730771b9517644819e83/86509273756.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16084bdaf1d3ba---59232070245.pdfIn PDF document text
    • http://yossy.biz/userfiles/file/dolefiz.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/vuvamugoxumisokazudug.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/kepakewikej.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4a99c7149---18374538326.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/vusesidomebipakozet.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/wafisozeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=9th+grade+math+practice+worksheetsPDF 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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 17252 bytes
SHA-256: 53f23fec29ebab1bbaac275d2cf4161dc701413777cec3fcf62b408958428188
font_01_sfnt_off0001095c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12173 11060 bytes
SHA-256: e4a62934f1b88a49b2236972578e173e8fcf814cbe51d08f190821e7707e73c0