Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b5c776ccfb1e93b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-01 11:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c4047ea4ebdc104a52408e3a8623e708 SHA-1: 8309affe354c3c27fcfffa748b6dc5c0480729ef SHA-256: 6b5c776ccfb1e93bdaadacde4f2f7fd548147d06c905aec8f10c099920193d4f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, impersonating cloud document services to trick users into clicking malicious links. High-confidence heuristics like 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' indicate malicious intent. The presence of numerous links to potentially compromised WordPress sites and disposable hosting further supports this, suggesting the document is designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/578caa415d1211c36dd1d78515362326/68181469178.pdf In PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/0agfv30b81hll8pda4r1a1lmm2/gapowubikoke.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/wosefesupifararit.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///39094943208.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pcbt8ke9oaj9kdo9b30otqpf70/72097875208.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/bixudevitexujokejunew.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/womasubomuluzow.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9eabb7690---tivujizalelubegopuxim.pdfIn PDF document text
    • https://cafesca.net/ckfinder/userfiles/files/8234929204.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/bawosona.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078065913cb2---gapikopupamivivugufaferu.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/7cd18da24bd0ea15144bb424832b4b5a/56589174797.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/musesoj.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/55853100619.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/j2jh9v8il00vbotm5qgub8b914/92867610505.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/5999944023.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/vazatofumimewataluki.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16111d94b18580---64953152799.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7462e9eb7e---nenawumemazonam.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/66391790074.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16103068cc625f---25141838939.pdfIn PDF document text
    • http://learningkey.org/userfiles/lugodimuxagetux.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/9815867367.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c19d517c---jejotetebenotolazetutare.pdfIn PDF document text
    • http://rinsacars.com/files/others/36676434575.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wulawabosasapoxegu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=excel+365+co+authoringPDF 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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 16752 bytes
SHA-256: 1a0e9880fb767ffb1531bb379d9dddc611ef2dd777f0ff9745dcd05117ccaa8c
font_01_sfnt_off000112af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AF 11000 bytes
SHA-256: 749cd988e75e66e0e0c7e34ddb89960a3833c3a6104d9f3a209b108674c38ad0
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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