Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51179eb18d31aab…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 23:36:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 924f79302c703459eb38bdcd10da1a71 SHA-1: 00522e923b365c717b04927f22068faaf3be5658 SHA-256: c51179eb18d31aab3a6b90c11a4b6c35072e15f23236e8f1a6be00f226e1090d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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://presstone.hu/userfiles/file/98694997510.pdf In PDF document text
    • http://asesorgubernamental.com/images/file/53990256621.pdfIn PDF document text
    • http://standartbio.com/fckfiles/file/bowubi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16107560876e3a---65972401945.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/nojuwazuku.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609744dd3316c---13240114330.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/25837674394.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/jekukonurik.pdfIn PDF document text
    • http://sgpeo.pl/users//file/furij.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/17792235195.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/ripabenawu.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/sojapagomutenofanuwuri.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/26352483595.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/tegimejokuxexugitidex.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/22008313257.pdfIn PDF document text
    • http://shophouse.info/images/files/lowejakumuraxuzawurawa.pdfIn PDF document text
    • https://humicdp.com/uploads/2021-07-20/images/files/venubasenudetejiduzodabu.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/52280923351.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/2rl5tln8m4ljeiaib4eberqvo6/gevodarowepubofadijezeda.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a865f93107f---danedopilizirok.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/28175796198.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c5b0bbd17e981e8098c84143de68762f/82664546089.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4fa4c9789---29661555533.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=phrase+utile+en+anglais+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC41D 19020 bytes
SHA-256: 01ef541590d7148a3bab54cdcd7ddb1c1ae5213d286710adfecd3cfb1fb922d5
font_01_sfnt_off0000f411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF411 10756 bytes
SHA-256: 7f38c528f91a9ffac50a850cd1c0854d3730aa0763eb5ae7094b084044d3dae8
font_02_sfnt_off00010c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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