Malicious PDF — malware analysis report

Static analysis result for SHA-256 75715f13d5c9e009…

MALICIOUS

PDF

74.1 KB Created: 2021-09-05 14:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 845ed4066d87026fac51b52ce124b9c9 SHA-1: 93958594051f963ca1c0d8fe7643ba69efa1060c SHA-256: 75715f13d5c9e00946cdacbb529e84a6ed3bd0d32bef88e79479863ee5a292b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this document is part of a link farm designed to attract traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cructi.ru/uplcv?utm_term=hematoma+subgaleal+en+ni%C3%B1os+pdf PDF link annotation
    • http://allaboutdowney.com/userimages/61858345315.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/55278310144.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/57016331396.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/3a131ef597dcc3572a9937d6a5aeed9f/sebolesutiganuvo.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/mekiluzinamijaxogifubirub.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/e0ms3s2a9rbv0hk5pvfvg380f5/juruzopomajoli.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c11d13e1856---bezejufekadejilozotal.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/mowilenawagedapexepuses.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/lst5sj5be9jr3agkhq0k076u27/tojosutowosol.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/88314487239.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/kuxesirejagapapikafojidij.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/18032296641.pdfIn PDF document text
    • https://rcot.org/userfiles/file/20313723341.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/notaxulimofibisaruwam.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b13ea3101bfe0eb64836713bd9009853/pofinujepadifaw.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/94505834344.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/c02elf3c26epd8tt0cj69g41f0/46630293334.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/96858516722.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/nijunexesagimefijozadag.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/09447cb50ed09a9f0e74a9e9c6929f26/meganazuzudowizixavalidaj.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/sumoko.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/sejipiloduwuwoxokopep.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/515e58e42d4b0863ec269599ffd80ee3/95345030773.pdfIn PDF document text
    • 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_off0000b9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D8 11176 bytes
SHA-256: 350ee4f0514d9c5ac5ab1e567b436516fd0f91e212cf6e25a2903ae75020614c
font_01_sfnt_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB54 17712 bytes
SHA-256: 7da8b492a79ee04d2b62d3e398fb326d36008666640f55b5bf7f70ed479e4603