Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef513728ff51c61…

MALICIOUS

PDF

78.9 KB Created: 2021-09-08 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 24561809c3dcfb544bab136f94372b2a SHA-1: c1f1b574608f8ee449745d97ff1720a9b13c47d1 SHA-256: 5ef513728ff51c61ca90ac6c79d5908b83d81a8f1e810be4dbd4b56c106370a6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple compromised WordPress upload storage locations and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/tavejojafosawiwiga.pdf In PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/e76o83tuqufoddb1hbk5ccgfh1/71541990258.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/p6n6oa06inllqt0pionom4gh13/lifolewepetoxomu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/lebanakefigagizujofojux.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/lemovero.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/511ae2cdecd2e5797dcba2d796ec8e55/tasajozixugadi.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/162029391815.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/genotibubamewir.pdfIn PDF document text
    • https://wecareprogram.org/images/file/41671963432.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/014b363079177ce752b521e9f6459ab9/21431042092.pdfIn PDF document text
    • https://baongochoa.com/upload/file/694648779.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/4827918363.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/3952517376.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/b395e99018ba2d7aab52685c579c11e8/ninonitavonorapon.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/45b6f72cc02e5528d6f2c60190eab059/38831531636.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/berederupazisa.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9be044d7d58a33908ed15ca854a1135c/96820114312.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/85334121835.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/27c90dbfc5258239daffe2f97a4b709e/bekadolaletexatobud.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c57191aa298---xekilozaforonepemiz.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbcae2ded5---zebabazusizuvexonu.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/8459837938.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/19580682571.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612d9f028dcca---tonobapeboni.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/rawumu.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/mogafiwubopopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=algebra+2+textbook+pdf+prentice+hallPDF 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_off0000d052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD052 16596 bytes
SHA-256: 9ab33ee85983d0e45c86e2284fa6c45891a15e8039871bce57fa2686050fd58e
font_01_sfnt_off0000fc02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 11164 bytes
SHA-256: 7816978673dc850a315e11fed4f229b2cab4b04b8303c87819bb6d62eb13bbf6