Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccf2c8b4e4587b4…

MALICIOUS

PDF

82.7 KB Created: 2021-09-13 21:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4c64428b55f76bd72b325c59bb07e46d SHA-1: 12a4d245ec4f478e690442d56beed25ce0e2c7cf SHA-256: 2ccf2c8b4e4587b4bc9d934052f936d588c4a3865fedb9aae70ad9f7b33fa744
184 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware. The presence of a 'download button' lure and callback phishing indicators further support a malicious intent to trick users into downloading or interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2e6465bf---64669235644.pdf In PDF document text
    • http://homeloanz.net/images/e/file/xuxixolu.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3f9e37833---91239081115.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/21031940354.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/gebizotuzitukuxukelidade.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/26668189974.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/73181418181.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/novug.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613de8c045857---62085015949.pdfIn PDF document text
    • https://wita.lt/images/files/sisekabaretafoxufopak.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/83651550559.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134bfe33e74d---roxajowinogabasanibotad.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/dunazilupagewipawaboranix.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/96869995056.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/37817114667.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a61a34157---toweparigotiwefovuj.pdfIn PDF document text
    • https://at1-turbo-j3t.com/contents/files/tulafigakerotiropasidokon.pdfIn PDF document text
    • https://jamuiboe.com/webroot/upload_media/59241816798.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613848a40f10e---83771888257.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/28f7a75245dd0aae69a8db2e179f6a0e/labetivodemidigefu.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/xavivosafu.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/5289810572.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/gituvuwu.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/74603023526.pdfIn PDF document text
    • https://terracell.pt/images/file/ropuzuwovamawubep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=asphalt+xtreme+rally+racing+mod+apkPDF 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_off0000dd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5A 17644 bytes
SHA-256: 34f08a5556948aaff3a8a8139b18aa9c4244f1f02cdf799f1293b5d52add3921
font_01_sfnt_off00010af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF7 11248 bytes
SHA-256: e2a3a85ada5e5c26b1b3270f5857913a3aa9290ec27bb08980e0046d063b2d02
font_02_sfnt_off00012517.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12517 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1