Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bbacb055b275ae…

MALICIOUS

PDF

83.5 KB Created: 2021-09-17 03:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 93093f1803e1696c03aa75fa749491f6 SHA-1: 90961a0c102c90ba4e74af0d39f61328bcd67982 SHA-256: b3bbacb055b275ae80f63982d659f94778e1cd4335d86d353dfdf4019cc84037
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document exhibits characteristics of a phishing lure, presenting a fake CAPTCHA to deceive users into interaction. It contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to distribute malicious content or redirect users. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://alwaysthesame.pt/site/upload/file/tuxadupopopepufukujidin.pdf In PDF document text
    • http://myflora888.com/ck_files/files/rezowaroko.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/64570997874.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/bufinozije.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134285db15a7---41332966549.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/30706150418.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/wazapejojeda.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/xisotota.pdfIn PDF document text
    • https://pindimana.in/uploads/file/79136057731.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/wawetet.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/kawobimuxo.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/dukimina.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/kobimadexibawule.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/naxamidizasaxebakuvidet.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/42487741021.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/54436123321.pdfIn PDF document text
    • http://savemaxint.com/files/file/xudafukusav.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/57373122539.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a2deac1dde51d2a0c75c8b0dd567de62/92583046162.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/zuvotirex.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/ponufuruzakukuv.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/bunenela.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2f764i9tki37ur6u5cmt1ciqc6/wufimisik.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ecbf731af---97396587655.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388aa8a13a1---balasesediwawejidovadu.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/nezugazonikisobemetole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=armed+heist+ios+hackPDF 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_off0000e088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 10556 bytes
SHA-256: bd2727cf0850d8b615cdafe2a5ba9af6598137fa304a67b6334729733749f588
font_01_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 18280 bytes
SHA-256: 70c4a53572950be033244d992a1dbe833ea72f18fef7b8e74dc05b13218b9fa2

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