Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ddf0c58a718d17…

MALICIOUS

PDF

88.8 KB Created: 2021-06-22 21:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 1bf8c298809ddc869182dfbe6dba2805 SHA-1: bdb29dcecd4b468c01508b149a2ccb1c537a475d SHA-256: b0ddf0c58a718d1760fa3ba33570e4a6aafaf41a9c8687b8a9f5250f6fa8bec5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure indicate an attempt to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/3jdhfed3gaslconrt09lcae1lu/raratasazo.pdf In PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/bf14112e316970114755c3ad1cbf1674/26913388782.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f48050b9a0---6696400737.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f10b1000d8bbd39a40f622fb4350fa55/zadirataxuzila.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/0293759538b910ce1ca484d53a9857a2/tijijawedenujumefu.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/so3dtm3itchhesi0jt31mh3r3j/geguzozuwukinetuxibifeji.pdfIn PDF document text
    • http://allg-gyn.ch/userfiles/file/38307937622.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d83aa1c651173b306b76026f28ab131a/nusoloxezefesekifa.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/guxujijujewomo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c0d0c078aa2867a969a0d657bc3fd0d/sinidawironibuda.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/jiwuvesafigigikujuko.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/upoel1qe9b0qqltgurlvh38j5j/nolaguniritolunaw.pdfIn PDF document text
    • http://poiskvod.ru/images/file/90485798408.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609649fec5772---lanogumorafirixobiripa.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16093866e33b85---kedumanef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=principles+of+vlsi+rtl+design+pdfPDF 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://scripts.sil.org/OFLIn 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_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 5172 bytes
SHA-256: 2086330063a7d137f1b187a1246ec38a7bb9dcea69064ba281ff9fd902fcaf71
font_01_sfnt_off00011bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB4 10692 bytes
SHA-256: f05c7429fd852ba8d1eff06a4285e30857b40b6138e6aa6ee927ae737ba68053
font_02_sfnt_off0001408f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408F 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501