Malicious PDF — malware analysis report

Static analysis result for SHA-256 b32aab9ed6fc4079…

MALICIOUS

PDF

99.0 KB Created: 2021-08-01 07:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1d86d3efe172c3cd90320afbbc3a2a5 SHA-1: 672fcd3be4f88faa282ff3ef17a5cd5d74b1ed72 SHA-256: b32aab9ed6fc40799cc6e1a7b4e4f73b0f20ad772a400f3b6b1f1f78d7a1f28a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress upload directories or disposable hosting. These links likely serve to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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://egyptsuntours.com/userfiles/files/divuderitujimoruwegifigob.pdf In PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160889209540da---jukizakat.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/62918800442.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/77001019258.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bcc107203---mipofapojofiloxer.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/p4u9ag6mu74lk4fmbk3nau0kb7/33742753066.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/xozika.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/2920346508.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607562f18d459---zumuva.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/fufakefoliguwat.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/mefekulet.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/lozerenenominuka.pdfIn PDF document text
    • http://taskentcompany.com/userfiles/file/votuzowofetawolobawupexu.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/64965489457.pdfIn PDF document text
    • http://atya.eu/files/file/19094545276.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/81624156320.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/686f7e27ee69c8f0394d52855ef9b3fd/2841301132.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a44403581---15884719010.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/67641240569.pdfIn PDF document text
    • http://willbramephotography.com/fitazuvusu.pdfIn PDF document text
    • http://area5srl.it/file/fawaganevebegudifanitida.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079713fcfdf6---suduzugiwowataf.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/59749438915.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/tonajesotapage.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/97753504639.pdfIn PDF document text
    • http://hotstamping.pl/files/file/12397279862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=elite+clue+scroll+osrs+guidePDF 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_off00012246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A5D 10364 bytes
SHA-256: 41181f37c39b14b818107e01b61d007b5164f18208bcb9946b99d3121619aa2b
font_02_sfnt_off000151a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A8 17172 bytes
SHA-256: d684eafdd047769fb994c6e24f01612929af0bbaa8299442807ab0260f7237fe