Malicious PDF — malware analysis report

Static analysis result for SHA-256 f471b7b03e003bc8…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 00:36:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3f16d3863f8505bd000fc72003c39000 SHA-1: b314a9913c0568a217c53aec824f6c7fa04207b2 SHA-256: f471b7b03e003bc85a53f2c8d896bcfc3acf1cb73ea27c33dc29e12823bbab80
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting a link farm or phishing lure. The presence of external URIs and a link farm on disposable hosting points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://sun-green.eu/ckfinder/userfiles/files/woteverovor.pdf In PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/f68b093a87b66f64eed1d39c70d7833a/zoweniposazisosorabu.pdfIn PDF document text
    • http://analhospital.net/file/files/gubinitirevokanuwumuz.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/73393619582.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/54084647117.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021092315472473499.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/romozijajul.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/tuzukuxuzibiresir.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/xonaluwa.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/91152d39be610b04a97f853d2ec11d3f/norud.pdfIn PDF document text
    • https://karjerastests.bankai.lv/ckfinder/userfiles/files/1692728390.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/29867010586.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/lk7e5clsqbp7j5i50fmqt2pptc/rofuzajijokiwomugupubuvib.pdfIn PDF document text
    • http://happy-land.hu/editor_up/97446479767.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/16716638109.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/85534318427.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/24068126876.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614769506f186---xutedomubixegusavefobafid.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109141856382262.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/89750867249.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f78398d104---tojares.pdfIn PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/38745382646.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/51841556810.pdfIn PDF document text
    • http://minipit.com/data/files/60870639896.pdfIn PDF document text
    • https://mudraconsultancy.com/uploads/files/bolubuvegepinavemomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+flash+file+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_off0000b0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0FF 14840 bytes
SHA-256: 2e56d6b596427937434bcfb67b44fb3fb6ac5fc475e383664063019d560c478f
font_01_sfnt_off0000d674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD674 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 10420 bytes
SHA-256: f1ef444522eee3b26196897b6662e47189ebf2f319b9f02c697dabff931cd477