Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4df0bb658763cc7…

MALICIOUS

PDF

76.9 KB Created: 2021-10-07 13:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0f3dd9bee4049f8f1dee21bbe84553e7 SHA-1: 73f47f4092e87ccbf42f19bb782470b5e11c7d76 SHA-256: d4df0bb658763cc73b6cd8fa114b0d77b1196e1fb44da1c786d603167d092df8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a 'Fake CAPTCHA' heuristic indicates the document is designed to deceive the user into performing an action, likely to download or execute a secondary payload. Numerous URLs were extracted, many pointing to file uploads on potentially compromised websites, suggesting a distribution mechanism for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://robertbah.si/files/file/44950272964.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/53113934865.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/naninowubitaw.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/xubakuxuwixaropiguri.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161492271968da---36343988634.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/mazusibofofex.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/wimivilusujanigabokalup.pdfIn PDF document text
    • https://tempatpasang.com/contents/files/ritapejujoxuganezikeki.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/91311225423.pdfIn PDF document text
    • https://videoeffect.ir/data/file/faragalirexixufo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161485e616c659---nexoxikuzinasefuwolege.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/paxejovopoxofugazix.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/75932963840.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141c4293bbe6---9331767559.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/ziminimavim.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/59198483030.pdfIn PDF document text
    • http://mashhadgardi724.ir/basefile/mashhadgardi724/files/32545558431.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c5e7c017---34650823979.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/51379121756.pdfIn PDF document text
    • https://tapuionoticias.com/ckfinder/files/mojeba.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/84005dd90bc464b93e8acbbba962daec/ninusopafo.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/dariwonetiwefibimuf.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/mulizimazexosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+long+does+it+take+to+become+a+lawyerPDF 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_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 16228 bytes
SHA-256: 5b980d02215f77242ce7b7bd4a7c527ae04af402e90139fb1663f8570458d200
font_02_sfnt_off00010bc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC7 11136 bytes
SHA-256: dab4ca6db112842876b117c03fca4a2e838c36cfce1bbba196b199a28eeae438

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