Malicious PDF — malware analysis report

Static analysis result for SHA-256 094242b306aac4c4…

MALICIOUS

PDF

71.2 KB Created: 2021-09-05 22:26:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b2a1f2b2d8416be41e031f6f02f82d6b SHA-1: d9f0766b9e857caf93ca0542e00e6f4908cf8c30 SHA-256: 094242b306aac4c4605fe3c637576bef43637d4ffb776dd3a2e222c718c4ab16
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV heuristic firings strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple external links, some on suspicious domains, supports the classification as a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://hoilhpnqbthanh.com/upload/file/gasexugopanozumufenubu.pdf In PDF document text
    • https://thietkevuphong.com/uploads/image/files/38502404320.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/58513552233.pdfIn PDF document text
    • https://nitdgp.ac.in/uploads/userfiles/files/34218250713.pdfIn PDF document text
    • http://xmzs.org/userfiles/file/voluwo.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/89574113922.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0ff55f35---1173699815.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d559d87de---47167862966.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/xamoretaxew.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/a09ece0f552d3a8f2b49d3ee2ad855c9/jexuwus.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/396f59efd44406939de57a9625922f7b/suwolajafam.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161044871b2431---80593653354.pdfIn PDF document text
    • http://zbirozskepodzamci.cz/userfiles/zazupizikawisa.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9946987cb8---belarabufaga.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/jagerogudelumewigiza.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/613098619.pdfIn PDF document text
    • http://poultech.net/d/files/72357606722.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/053e4da68159cd63e655bc42ff3b55b1/95113332610.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/dijasugafoja.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713fd318d9d---legemodomus.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/79db2dolbr795nld83kl6g71ih/26689678077.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/logurisagejezow.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/wafisadabudibovajamagital.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f03ca2048a4---78335824054.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/76425791324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=religare+health+insurance+claim+form+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808a55cf125---13292536869.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_off0000b5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB3 15692 bytes
SHA-256: 111b25f92fdd3b6f812902d2893a99fd3ae8b562eb3ca0f52c42459e33e192d2
font_02_sfnt_off0000f539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF539 11212 bytes
SHA-256: e7b665ff906ca2a65356fe675e0fe253662191e76131173067d44594b76f5ee5