Malicious PDF — malware analysis report

Static analysis result for SHA-256 340410de491a7747…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 17:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 344730aca78bceaa2802d07e320c8984 SHA-1: 3cadbd1f5dd94e4c812f67035dcb4ab48d2a43c3 SHA-256: 340410de491a7747838abd995783e4fc5ffc2feec28cd9ad51c7f7f8776185e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The presence of a 'ML_NYX_PDF_MALICIOUS' heuristic and ClamAV detection confirms its malicious nature. The 'utm_term' parameter in one URL suggests a phishing or scam attempt, likely related to game hacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://queure.ru/uplcv?utm_term=yalla+ludo+diamond+hack+apk PDF link annotation
    • https://atavio.ru/files/file/88123867284.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/sedokekunijogajoxox.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/61696841610.pdfIn PDF document text
    • http://climacom.eu/userfiles/files/xojafosawekufefa.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/2vb27lvacil1f434mpdcrlvtr6/6659033793.pdfIn PDF document text
    • http://av72-reklama.ru/userfiles/file/1631008136cf3aca45a777c9bc0430.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/43402963607.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/64654480121.pdfIn PDF document text
    • http://minhanh.com/files/96721108572.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/sudozojevexa.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/dopewepujixekebamiv.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f25b0043e0dcdb91b34c2a1471fcfff1/fesozurege.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/vegelawarebopiwuwexa.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/73521323271.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/rewuwegov.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/7670656627.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b026049cb---23617108950.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141a5b76c531---45085788264.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/munovuzagapivabej.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/bofupudelosebojun.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/gabifibuzelone.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/65747148146.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387d64be7d6---17437225430.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/digesolizixiko.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/161327f7763969---11486061988.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/88248330260.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_off0000c120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD937 10456 bytes
SHA-256: 6439130e9b015d8df3176f4fb01e9665c1a704e97bcc506bcebc328787eac3c1
font_02_sfnt_off0000f099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF099 17900 bytes
SHA-256: 92fefe87ac34de9bc7f9588061e71e3580676e3c9166eb89600b33561a5ad74c