Malicious PDF — malware analysis report

Static analysis result for SHA-256 df9cde31947fa664…

MALICIOUS

PDF

96.8 KB Created: 2021-07-29 19:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 948a778b6804fea6344956da1052220d SHA-1: 2a0bf4753a03fe97fcb62088fca3cdc54f7e0a11 SHA-256: df9cde31947fa664e0038021dd025bacf92fb4cfd92fd51c9a985e3af3eec425
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which point to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or delivering a second-stage payload. No scripts were extracted, but the presence of external links and compromised hosting points to a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=connecteurs+logiques+anglais+pdf PDF link annotation
    • http://maychamsocda.vn/images/userfiles/file/fawojoxafavunabiwonirero.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/50028273542.pdfIn PDF document text
    • http://hillcresthigh1971.com/clients/9/9f/9fbf9047a6869172a982db6f42f05a9a/File/21668054153.pdfIn PDF document text
    • http://pointerboards.com/uploads/admin/files/46969960910.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fehlig42arti7ir99gmdk30824/83145790581.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/35014318772.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e0030fef---64179238654.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/pubosodezajus.pdfIn PDF document text
    • http://espiber.cl/images/uploadedimages/file/paxezimegowilonudotujo.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c997bb8dbc4---97574895815.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/talubuparadev.pdfIn PDF document text
    • http://dharmapremipariwar.org/userfiles/file/kilibiwo.pdfIn PDF document text
    • http://schubert-hh.de/image/file/49086631734.pdfIn PDF document text
    • http://planbmedia.hufiles/zilulixowegedeb.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ing076rtus84d6qssm7pn5f846/ratozulujusifagu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/488bc1357395bbf9f968642e375147ff/lubosuxasemanexigagaxut.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otpcljiuslphva2v13qf6lk4v6/44860052969.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe5e3a1c4a---40692138608.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dce78f36e89---wavitorigezekilorabitabi.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/qqb4gn3ns9h6burr6ghtpchak4/gijuje.pdfIn PDF document text
    • http://veivel.com/userfiles/file/71095727085.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16092dc3d81cc1---12850235336.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b5u6qcjnblhl9ceh4sju8fdku4/lelopozafigipebuj.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 19320 bytes
SHA-256: 5c6904d60df5996d3a842e46d5f3afb8869693e134d83adaf1f2dcd52298a1e4
font_01_sfnt_off000125ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EC 17752 bytes
SHA-256: 469df10fb9ee7a1bdbd584389ad1726a4ddede9f3a2b96d96ec16aab987b1f50
font_02_sfnt_off000140a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000158bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BD 11072 bytes
SHA-256: 0bfcad867c95bd8fa5912f1c7dd47e1a1cce4a74bf3ff71337155669bb33b491

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