Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d0d3e26cb7cf307…

MALICIOUS

PDF

90.7 KB Created: 2021-08-06 19:28:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 39d1279afbad71609285ff0d8789a160 SHA-1: cb924a7a1e274d78863a43afe9a8ee5caa006bc7 SHA-256: 8d0d3e26cb7cf307afa53a98f23014d1ca7475e0df51c1dfd24934cc9aba1a3a
104 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed for SEO manipulation or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. No scripts were extracted, but the primary attack pattern involves redirecting users through a network of compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://honmamon-s.com/img_seminar/userfiles//file/pimomarepewifofa.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/g056jleden5a1hbb6f6dffcpc2/dufanimotafoxovekuniw.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1e25316059fd414307552ad11772e0eb/87081938983.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/71285034484.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/d4viu6ecvgv7097akeuk8a555q/xemugosewes.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/67721952294.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/0340b96a451ed2cba541c34fd9c8b255/wakobe.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab485e9a132---sopedisenutebimetigamif.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e96374b47c52e67726ff5face7a3b650/85553350135.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/q87m6io1rc07r0qlfaujga76ah/81219407581.pdfIn PDF document text
    • https://hearing-outlet.com/uploads//files/202108031313267739.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/rsjj0irmsjbtse5cff7qe648m1/15918130177.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/purobimilazijurojemolon.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16093b249278f0---45968038579.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df1b862ede8---luganulijidax.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609621be9177f---wilifivenuwokogifiwepen.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/hp6lusetoipo2r9fc5cikqfkj7/nojuw.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/gefiwed.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/fopulumajidaxatenojuvesu.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/9351511673.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/2hacvmn9bso3f4jiplllfs6ure/gokavoroxaluma.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/6a97a27ba2e553a3ba54b9ae09c9f5fa/wadijopeguxezononulin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=daily+work+report+template+excelPDF 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_off0000e935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE935 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 16860 bytes
SHA-256: ffdec2de1f9968da1caf948bb4f7ea26aa5a222e09daaa3271533dad3ea63b21
font_03_sfnt_off00014347.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14347 10656 bytes
SHA-256: afbd57946360dc30703f2ce4d5cf2a547f8b639af3891a9f8c17589a324b26c4

Open this report in the interactive analyzer, or submit your own file for analysis.