Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e618a72d3364949…

MALICIOUS

PDF

76.8 KB Created: 2021-09-04 21:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19610fa16e777a0616e0044968ad3017 SHA-1: ae499bb405a1c1717674a56d855bd4c7dc03637a SHA-256: 0e618a72d3364949feb5ca53597733e584e449af5bba85ca67121934ad5bf7e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba665b6d03---joliwisewanija.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16074723e5bc69---78291246123.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/79299967157.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/sikotuxukipexopem.pdfIn PDF document text
    • http://flomojapan.com/upload/files/48027806737.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1c8a0f3616522ee52d0f74fb0d0e07db/11317346097.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/79073427780.pdfIn PDF document text
    • http://seventyfirstclassof69.com/clients/60772/File/fawiwefoduwirufadebolide.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ad72a539e68c2f8020d9850802919281/9664183779.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/82412408229.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/53831847909.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/6987927591.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/zotagokuxodegaw.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0d21601b6---4611088208.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac51abdf994---98099455323.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608257ca536ae---tivaselisegu.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/01aa6aee19abd6536c8303d200422e9d/fudozanomadoxevopusolexij.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/34146943733.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/44048812026.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/dijufalazuwixigujuzotug.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f8bad6808---33022027960.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160edbc831690f---92234421043.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4956ac7641---muwosigikonebijoxuwukug.pdfIn PDF document text
    • https://shibbirs.com/media/files/37481036638.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=hyundai+excavator+service+manual+pdf+free+downloadPDF 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_off0000c51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD32 11240 bytes
SHA-256: 7c733fadcb547055cdd31c37f33717e6afa53d08adba4392d7fe74cab4581fcd
font_02_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 17640 bytes
SHA-256: dc112b510f8210db4ca8938e488e0832ecaf6aed52fd9190f3876392c902438e