Malicious PDF — malware analysis report

Static analysis result for SHA-256 25328898a20afc48…

MALICIOUS

PDF

93.1 KB Created: 2021-06-27 09:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f63b4c16d3ecc6f1459e2df15479259a SHA-1: 72a8df13489d844533800ecdd2639359c766deeb SHA-256: 25328898a20afc48413ebd54694d92dcad2078d29d24015574e99c0ed8ffa89a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm indicate an attempt to lure users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854f64bc868---bemezatujuj.pdf In PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/42ed26d58187b813a3ea2d1c227013c6/86858644673.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/wiwetodezox.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/58602127869.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160784cc61ad83---33724988891.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3913470f1---nakanigula.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/5a8d4a47ccf53fe02654f555232ca3f6/luguto.pdfIn PDF document text
    • http://4bx.pl/public/file/lerufa.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/65895216242.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d813831a43---jetivitufujuj.pdfIn PDF document text
    • https://hirurgija.me//files/69889418663.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/35286571741.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021060511505530.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/6157de1fd5d2bd41846fa53adebda67f/nulefoluvawanakaw.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/35193483424.pdfIn PDF document text
    • https://prosperitas.be/data/assets/file/nejanerotege.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/sasojijosebotixer.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vanojunowiv.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/33bb4cf4664b51ceb7843005918f4386/50305257121.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/k0k0ss55jsgdunm1cg8mnjs4gp/18737876634.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210620_152529_3501.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/9c1411f498781240b3bdbe874085a613/66288781893.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/49f6058e1d6ae40796466f0b793bd78b/databowusekow.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088c6a73bbdd---solesogowa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=interpass+cleaning+in+weldingPDF 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_off00010ac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC5 17188 bytes
SHA-256: eeb174a0cc0c3f2083dd98cbf44f5403d76a699c7017f9b24491f98333d48fc7
font_01_sfnt_off0001371c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1371C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F33 10608 bytes
SHA-256: d93e817461bb0b731fddda09be4d66a3f52a1164462755bec09bf7d9c9bc76a3

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