Malicious PDF — malware analysis report

Static analysis result for SHA-256 be528067d505cff7…

MALICIOUS

PDF

85.7 KB Created: 2021-09-19 09:14:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e69f951816c5e3b24a3502369ed723b SHA-1: 7c9f2871f6f87ee545a3533c3a319012aa5c8434 SHA-256: be528067d505cff78489303f11c010ba55fbe340a3ffbe30949cca4e8741adad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://aleshashop.net/uploaded_files/userfiles/files/kujexiz.pdf In PDF document text
    • https://northwestconvention.cz/data/files/31458622646.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/xolevesojikil.pdfIn PDF document text
    • http://eko-uklid.com/files/file/69866779001.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/kofokedasetedabuluj.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/92022242765.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368d8c06ec1---24307164050.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/48754947229.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e845b10027---65400617916.pdfIn PDF document text
    • http://geonatlife.es/ckfinder/userfiles/files/77664824931.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/40312743464.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/nibilizilotimokuw.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/murejomukesulo.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/r68npc6bmgppa26cipe20pv632/bebubamazabopuv.pdfIn PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/96089366884.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/35526496095.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/99770348083.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/rokugexalonisaxudumosu.pdfIn PDF document text
    • http://phonphangschool.com/upload/files/47391730894.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16136955f35661---kovotiza.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/33987642620.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140ccce54ed7---94041911251.pdfIn PDF document text
    • http://studioscoponi.eu/userfiles/files/23037056760.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/vigebegisaget.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/52967318370.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+live+stream+app+for+androidPDF 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_off0000eb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10314 17724 bytes
SHA-256: 102dce080801683a70ebef99e6ac5686f2a3c6e39d1543178745426bd1fe985e
font_02_sfnt_off000130b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B2 10776 bytes
SHA-256: bfee5b473c661cd79834c0d2542e75315635632b55366e7045f9e9687d3eba0a

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