Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b97b9a0e29cd313…

MALICIOUS

PDF

80.7 KB Created: 2021-09-15 09:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 15e1fa8f9040acc819d9af9a204f9c39 SHA-1: e94bcb5e9f3d1cf2654d3f64d28b357687815cc1 SHA-256: 8b97b9a0e29cd313884b746a24d3dec659c19c606d369e82f9ed0f41d40e9f3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The presence of a URL with 'sims+4+download+expansion+packs+free' indicates a lure for users seeking game content. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=sims+4+download+expansion+packs+free PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/794ace33d93818eb53eda3991661c506/goxipupupupafenudefokofax.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/97041308579.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/35922103555.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/dokuvipimi.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f1e819ce---12445429362.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/86540225560.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hqpr486nh8crm9rqes8163jqg6/sufarupemu.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/vujusumi.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/gelibo.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/2458893851.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/fadedepipelubikoxi.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/24667620601.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/66948624037.pdfIn PDF document text
    • https://iohrp.org/f_files/files/miribabepowop.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/napazalunefojijeramadamuw.pdfIn PDF document text
    • https://qkon.ca/images/file/bopisawuxobo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/nezirezewudabuvik.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/82655788425.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/govowuwi.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64afab1bc50e1d232a734e32c65a57ab/pobefumoda.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/ff6b9e08c1c48c5fabceab1e7af235cd/mebajipo.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/gfm9tg5mh4gun0ps8dr0dlr4k0/buwotur.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/63408285827.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_off0000d5ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AE 17576 bytes
SHA-256: cf063227bcf946c6f40b90e69fb1e193db1a6370082a7db22cab7941e5d06ff9
font_01_sfnt_off00010354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10354 11116 bytes
SHA-256: 77ec6344a89a70ea41a57280f90b0f42883f7eca97faa96b19bf2cfed0a50ead
font_02_sfnt_off00011d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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