Malicious PDF — malware analysis report

Static analysis result for SHA-256 c56d40d0f6aede85…

MALICIOUS

PDF

75.0 KB Created: 2021-09-05 14:10:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bb169804e8bb3d04d974efea94c04b8c SHA-1: f25ed8f7ec927833a547fbcdf018f60c52d0e994 SHA-256: c56d40d0f6aede85a744f7918aecacff8b09ebd7614759e21d608a2fc8b12e91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these links and the overall structure indicate an attempt to redirect users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://synerhu.ru/uplcv?utm_term=fender+jaguar+player+series+manual PDF link annotation
    • https://www.epicbrands.co/wp-content/plugins/super-forms/uploads/php/files/087f8624e74b45c1c54015bf0cbe1dee/binasexogodixisil.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/aed48j43565l34pee9i915glo2/bosuwokowavegijawawep.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/63959062799.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b0d44c88d---48995333999.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/76986014375.pdfIn PDF document text
    • http://caramelitos.sk/files/ragezewekilok.pdfIn PDF document text
    • https://virker-ikke.dk/files/98905869059.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/rikuzit.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160896dee2f33e---mavaz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f1a5ac4146f7cd2354b33d3a320bbb77/rutawajirozepu.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/98118295723.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a63ee765b87---dujixovisebitox.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/4e6a204072aaa8608b542586f94a1454/16963992609.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/sakipirilebarapu.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609481dc545a6---38848457225.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3af240a10e---52142247320.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/fenifurutuwupulo.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/42758876077.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161033cd889193---49630522141.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/16320187299.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/974e788b4a784c7eef3798ca6d2a52a7/99330984539.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c831b0822d---lozirarejexakifivot.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/4134838046.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d50b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50B 18112 bytes
SHA-256: 53778b82764f1a7fdc0be636036b05baaf978fd8c9b4fa31354491652e977c56
font_02_sfnt_off000103c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C9 10836 bytes
SHA-256: ee06ba4fe686f765a92eacbee7b7559bf6a61783fff5470aa7954735fb0b34e4

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