Malicious PDF — malware analysis report

Static analysis result for SHA-256 a041f1379330dfa8…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 19:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0cf68d9a346ef092e20c22c68cf9f8e2 SHA-1: cea6d0a72606893526bd47e37722f0262a199043 SHA-256: a041f1379330dfa8628fa2e98b164fc5a1758f26df26a4492b979b415138911e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate the PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's used to distribute further malicious content. The document body was unreadable, but the presence of numerous PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8m1l6ktn2f46buq5k82an7v8nk/73431488733.pdf In PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/38284094649.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b03c9cd3b---44949054093.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/20052927639.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142faf1b1966---suvafatipasa.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/dufuxavigatowinono.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e931ef19f4---mebixutinepukirivizonijox.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/10675997769.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/77454812087.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///55160457291.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd1f42b807---baboxifat.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/4097026873.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161327c80ee7c5---26048314786.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/rujax.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/57538121816.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e77cb4046---wetamuguv.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/gawubijasanu.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/sakadufuwamakabubetelop.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/94276553176.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/xukek.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/61384902921.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/kuberijuluvixabomuzizik.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16147445d70c7c---vovurorapuxagozimi.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/83434249101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=batman+icon+packPDF 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_off0000b43e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC55 10236 bytes
SHA-256: 7e5d6dfe08e5e5849fb0b10c7f860290f69c9bb1c03ef3923f8f14e3d7e2e96d
font_02_sfnt_off0000e354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE354 15944 bytes
SHA-256: 1e3db138e6f4bea1342e6da6099d09a3f27662d44c0f87f8f60d7c1f5b52792e

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