Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c1fb826444442c…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 19:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fe5a3fdc2fbef2e42099e863dc50a87a SHA-1: 82bb53565aa627afdf1edccd28478c90b557da6e SHA-256: c8c1fb826444442ca557ca68c84698c87f6fa5ca9605762c61fa62214c09aac4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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 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://inwebjor.ru/uplcv?utm_term=free+printable+math+worksheets+elapsed+time PDF link annotation
    • http://waberry1969.com/clients/877040/File/porokogewudowawota.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9eb58a749d---18534037120.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160991429501bf---fiduv.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/vijupibuwekid.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/47446407484.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a23f4a412a5---roduwemeborawemilejiw.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/xokitegexujagakibemexirig.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/17070512808.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/7ef08fa39e777d83c88d792ce5a39110/burekuzexidibokutajirexu.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/78907753678.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/punubegaxofeposevelaxuta.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/fufizikapal.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16121814035bde---80744729237.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b602c2bf3d2---15845869566.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612081253ab63---tikizewemopefowoguse.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9da4f8c286---donosutagedugiwigiw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/ae6ecbb6281a49e66517a5d249796587/70221593742.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/34190833042.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/qlr6r0vqjjsq10sp632u0mmj5q/17980776525.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/95803770093.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/o03blrcf082quk4m9e6rks44up/47202840408.pdfIn PDF document text
    • http://maygiaphat.com/upload/files/bizibogamenaxesebimade.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609db7e39ae29---damaxujesumazi.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_off0000b490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB490 10952 bytes
SHA-256: 3cd342d35e6188d83420d75bf14c9c5c458fff9e58ab007a793b08909cfc2893
font_01_sfnt_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 14856 bytes
SHA-256: d1b79838e596c8f0d015c0afaab4d40d3b9eae0c65d002eab54db70a033c0cf2
font_02_sfnt_off0000f209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF209 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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