Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79c7d5a841cfe3a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-07 17:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a94888e302f7c75d2b47e94745bacf6a SHA-1: 2ebb194f4e74afafb6b2b4afe76690717d9a3a30 SHA-256: c79c7d5a841cfe3a97ac43347bb7b990e15decc6452a2333f38073551f8813c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to other PDF files, some hosted on compromised CMS uploads. This suggests a phishing or malware distribution scheme, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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
  • 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 http://adria-ex.com/images/blog//file/rafaxadak.pdf In PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/rorokasapowevunod.pdfIn PDF document text
    • http://violetstudio.in/userfiles/file/gokixogosonowajavapiri.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/21150385272.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/42c211cf3faa5acf2f1e6db435b58708/88053427380.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/192928237660e5a65dde404.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/24640010443.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/99609232584.pdfIn PDF document text
    • https://dafelia.com/files/71757368681.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/lutasaboxajunitef.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/71920313542.pdfIn PDF document text
    • http://cyuanmei.com/userfiles/file/70462265517.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083a8ed73053---vomepejuponef.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/28047089985.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/23320316170.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/690d6cbfc119d878ca49e61baaf210c2/16463040574.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/jesutuwelinozedomatule.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/napibefojizunuvedebitu.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/32837340663.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c026e3ccc7---kimewaje.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16105ddf4b703f---xasusuvudadupomuzuzoguna.pdfIn PDF document text
    • http://bloodfaces.de/attachment/file/52947944605.pdfIn PDF document text
    • http://camelliafb.com/uploads//files/202108050754526460.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/fonokuratikimojes.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/jijuxepukurivep.pdfIn PDF document text
    • https://raljob.com/userfiles/file/mopopikisikuxadogojopapin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=ccrt+scholarship+form+2019-20+pdfPDF 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_off0000bab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 11176 bytes
SHA-256: 8ec9b318e3ee3bb6f850660b0925bf9daa74824b914ce757fa62263b0f618a8c
font_02_sfnt_off0000ed09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED09 18608 bytes
SHA-256: d5bebaa81b6b9104c4e2d43bb5408eea6f4e7b470e966d12a337cb95c5f299b7