Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b84f258b15bdfa…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 12:29:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d4c23acda5b18651d70379fbf3346855 SHA-1: 65fb52551ed2da6608957bc39f1ef1fab13ee28c SHA-256: 83b84f258b15bdfaa4c4b3c50056e21e182d5aedb77527cf4fd1dafcb02a7fd3
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites and disposable domains. This pattern is commonly used for phishing or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://americusfelderfamily.com/clients/0/0c/0c5e5e27a4da9db51eb23c24aa0fa274/File/pinepaminore.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0f500fa81---29621206538.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/38678187277.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/kasaduneguze.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cpo66iqh1g6083b206bt8qtbd8/54812089699.pdfIn PDF document text
    • http://buyyoutubesubscribers.com/ci/userfiles/files/27456204003.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/60003217964.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/83a048a7d9d030083ab0729315237ef0/bujawopiwoso.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767ac4d7f2d---59912734814.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/95040815813.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/furukivusaj.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d07665c090a---90358228064.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/e581de23597c7b89bebf220354c49b7b/dukur.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ec5df900a8d8c649875397c06fec094b/wagobagopajaku.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/78269036418.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/suduk.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/92936720991.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/6734102630.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1610c28b823bd1---fuzepetedukiwumezow.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd1c3274aa---bidapibezubijon.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5ffb7bcb7---31313222484.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/95846777523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ansys+fluent+theory+guide+17+pdfPDF link annotation
    • https://mediaget.com/userfiles/files/zakinidesataxu.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_off0000cb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB44 10912 bytes
SHA-256: fb2a70b05ddfedce8e1cfc39a6ca0e52eb2c712edd6cce1f8dd04c802edd19a1
font_01_sfnt_off0000e467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 16312 bytes
SHA-256: 1debccfd2834bc38ae50fb26f49e5c5997362b7c3695d5a325f539aabe998e0c

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