Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbb0cc73e8c6f0b…

MALICIOUS

PDF

76.8 KB Created: 2021-08-28 15:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c038e01a23d15ea518e24a58e882d14c SHA-1: a9f998c986c69bca7fd5e78babdf5c0e14f2d332 SHA-256: 9dbb0cc73e8c6f0b61c4d6c7b2fa8b710bf77d5419870389cb02d1a40091c127
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing a link farm that points to multiple PDF files hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. An embedded JavaScript stream was also detected, suggesting potential for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/66798874917.pdf In PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fde349f134---66318159735.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b511ed76a---46507327989.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/vizutavugokuxozagedofexu.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/66517190772.pdfIn PDF document text
    • http://topup-fight.com/ckfinder/userfiles/files/korejoluwuk.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c087d95012c---24962332962.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/xumodotuwumexudose.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/f90e2cc62932fd075ce26c01c26ac9f2/11405828815.pdfIn PDF document text
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/jirudagubeku.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/rapijumageji.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/91923835976.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d55d2124b---bejofupazisawezidefexali.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/dorunu.pdfIn PDF document text
    • http://tcurryproperties.com/konadnew/userfiles/file/nenujubilajow.pdfIn PDF document text
    • https://andhimazhai.com/images/files/65363454008.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/501adb335f798bcb98391e06f5e6cbf9/fimofijiruda.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/88035876393.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/14510960819.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/82696094850.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/sujonekujuratita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=ridley+creek+statePDF 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_off0000cb70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE382 16744 bytes
SHA-256: bac2d0a4f8ed7d592620a3dcc8f506d48699e314ef70360d488f2e44b322a51d
font_02_sfnt_off00010e96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E96 10392 bytes
SHA-256: 6d9b7ebc5d6c0442a7761ec882b9dead662a58e4cb7c1e8f6cc48dfb8eeff0b2