Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f6d935741ff8bdf…

MALICIOUS

PDF

75.6 KB Created: 2021-09-09 19:32:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d100cb76e309f37c2cecb7bd321555dd SHA-1: ecfc20d7b8803fb9839cd7e67d228b741cce757b SHA-256: 3f6d935741ff8bdf2547dac215400e3830604415a452b3d76ce92821eb5f2f2d
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, indicating it directs users to potentially compromised or disposable hosting sites. The ML classifier and ClamAV detection further support its malicious nature, with ClamAV identifying it as Pdf.Phishing.Trojan. The embedded URLs and link farms suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://skatrip.com/basefile/skatripcom/files/36595451289.pdf In PDF document text
    • https://takarasushimn.com/userfiles/files/20115390958.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/58034145778.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd47e9aac---15086439492.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/ragoguwuwisix.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/62776906441.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/40237254937.pdfIn PDF document text
    • http://drironcat.com/images/file/25836046894.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/falaxego.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/93108732194.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/37876111445.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/buwizugaloviketasiv.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/32903957935.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/1aijbrhipmi8jpikv3p97kgf3b/83654027601.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/bagupeburajoxomexaja.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613923791a758---bogobo.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///gefavarimit.pdfIn PDF document text
    • http://royalgroup.at/tmp/sujofolemomifimin.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/tulodokitulibibizej.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/ruletumosopazafiwipabi.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/kenikubukatipalomowiduj.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/saronofazurelivogis.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/8180309768.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=minna+no+nihongo+download+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_off0000c5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5B7 16920 bytes
SHA-256: 7f7f2557538f4be725ea505525ba881d4185ec8041c06f90666d61335809b9d7
font_01_sfnt_off0000f1ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 10360 bytes
SHA-256: 9f8cb4ebad136298de9fc2241228e9a27952ac15db127f408128dbcdb76297a3
font_02_sfnt_off000108cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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