Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c4a87c7ed1c349f…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 22:27:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bf8c692cec1438f6c63b7731a4bfa497 SHA-1: e453e7f081f59fb74d7aff4524dcba3649160473 SHA-256: 8c4a87c7ed1c349fda8e9350ddb893018c06d65b14b94ea907b10ef8062d6813
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, likely directing users to phishing or malware distribution sites. The presence of external URI heuristics and compromised CMS upload links further supports its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=funny+pool+gif PDF link annotation
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/63400206144.pdfIn PDF document text
    • https://gruppopolidori.com/upload/image/file/47956324712.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/korexiroxafuzoso.pdfIn PDF document text
    • https://songiadahoaian.com/upload/ck/files/kijagejonopatub.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/jujakelason.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/bezapakuvuduzidutubaramab.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/73802274818.pdfIn PDF document text
    • http://tnhmc.com/userfiles/file/65022974422.pdfIn PDF document text
    • http://goref.ru/files/file/9071499397.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/bacc7886cc2e1e209f7848d3f65fabdf/62861080513.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614414db676a1---74104346560.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/3ffecc9290dcb9bd0e4133e561cd2f23/31810989694.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/15673833394.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab682442e6725bb5eb728f616d5d8fb3/vogebutuvigod.pdfIn PDF document text
    • http://hfnhsw.com/upload/files/62864487327.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/4f949b272a85424e6e3812adc34c4c93/nifuranuze.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137452e903ee---tiruxalam.pdfIn PDF document text
    • http://talentfuturesservices.com/sharpinstitute/images/files/kujemuluj.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/wefujediwagugubifit.pdfIn PDF document text
    • https://dm288.com/slicice/file/12663151258.pdfIn PDF document text
    • http://greenbrier101.com/userimages/35837445441.pdfIn PDF document text
    • http://carbontuning.ru/file/soxulipudatotadabagoj.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/befero.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/wosekoverisinaxijarilap.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_off0000c6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6EE 16880 bytes
SHA-256: 2652c536d4247c46c142950d6b8a2c23035c95d6954f15b01bc9816cb155f44f
font_01_sfnt_off0000f266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF266 10064 bytes
SHA-256: 5fc03d5045d97f06154cd686a167888fa9fed53ac2031f88c11f8f0d6c842bf3
font_02_sfnt_off000108d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.