Malicious PDF — malware analysis report

Static analysis result for SHA-256 c87f96cee1210a6a…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 10:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 83b46d87144c733ebbf601ed12bd650c SHA-1: b5a1aee7491e0ee07666e16baf33ad5cf241fd96 SHA-256: c87f96cee1210a6a2f97ae29dfad279a0c0412e6d06021bef5946e57d3b3fffe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=purging+and+bulimia PDF link annotation
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079b44629961---40135799408.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/58250489073.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/dirilufitobudunewikor.pdfIn PDF document text
    • http://cartopack.be/Images/file/17476013572.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6869abca8f1f8c3faf9ac062de2486ca/51737552913.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/65582887898.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/271c4c8e30a6be38f845d38c91f971e2/75955036241.pdfIn PDF document text
    • https://kopari.hu/files/file/82875759555.pdfIn PDF document text
    • https://bataretak.com/img/files/file/wepedegigazezaluwozo.pdfIn PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/bikeginorodofer.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d67464124---kixasid.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4tcfhg8rllh7odtqijacj576ht/45250947836.pdfIn PDF document text
    • https://mastirz.com/userfiles/files/91161478151.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f12e266a2e---majeduzopuvi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/b9fff90f8bd82ae1c2e91580039ae0b2/vaviliwamifosufad.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c6ceb35ce9dd52ca7e47f567dfd829da/14203752959.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/tosupofoxog.pdfIn PDF document text
    • http://daedukgs.com/admin/fckeditor/data/file/20210702142706.pdfIn PDF document text
    • http://learningkey.org/userfiles/77623328267.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b5988683---kujidasegovoxarofoke.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/somufebasimisomotidudi.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/40253960289.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4dad3e6da---gidera.pdfIn PDF document text
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/diresalufoj.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_off0000eaa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA4 17952 bytes
SHA-256: f0c3d118cd803541f6748503db633841a044eacd3d000e1c275aff2de1b70ca7
font_01_sfnt_off000118f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13110 10312 bytes
SHA-256: 151fbabced67edf80890d7cc28bfe3090c846810a4e2185aaf7365764c7f37e3

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