Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b4be2504c8632f6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 06:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bfb0335a6f5dea384923341bc7c79370 SHA-1: 01225ec54fbc43b8e5df77fdeabaef293a739556 SHA-256: 2b4be2504c8632f6d82d2ee4fb973bc5a09ba1c276672f416e132a147b92730f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to direct users to malicious content. The presence of multiple external URIs and a link farm heuristic indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://corianderedmonton.com/ckfinder/userfiles/files/jiwofebaninarelitigi.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/3161599bd895db0c1a5dd9e67905d305/42525765694.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/kosikewaxaradanoroloritov.pdfIn PDF document text
    • http://pitchdecor-construction.com/user_img/files/vumumekenonimuxu.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/36887173118.pdfIn PDF document text
    • https://forumsevens.com/images/file/zuzaxaxidurupuwonigagezej.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/vovirabagigi.pdfIn PDF document text
    • https://wildnaturetravel.com/File/18209282499.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/debafezuwo.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rn7k88gb15qnr3efl4obj3fr24/terunalesetirelabovukidad.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/56244160056.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133b7b4e6f7d---konutet.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/29615716132.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/buwaribu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xupelupatejo.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/majupufebuwizisa.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/31367765538.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e59a12a15c---tudif.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/bebakijufobanefu.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090521045962.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9f2fc6116f03df0cc4a304991f725495/vosapo.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/14298805274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+get+robux+for+free+appPDF 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_off0000dd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD56 18000 bytes
SHA-256: d41e574bc788376b7416828bc4899c95482b1235b9a018c4ce9c65aa8f03f682
font_01_sfnt_off00010b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6F 10540 bytes
SHA-256: 9ffdc1492519a685621b9c12ee491339da82e8505a0f62b5410f1653bd8730ce
font_02_sfnt_off00012378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1