Malicious PDF — malware analysis report

Static analysis result for SHA-256 643bcb755118a8ee…

MALICIOUS

PDF

88.7 KB Created: 2021-07-28 14:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0eb6a01fb4cd5c8e91c7dfdabfc9bfa5 SHA-1: 71a0a5c73a58d148fac2926a784b698dffedc68d SHA-256: 643bcb755118a8eec6e9112d9dff4c1a3dc704625cf4d8c0ace0450cb29e2fd5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress sites and other domains, likely for SEO poisoning or to host phishing content. The presence of numerous external URIs and link farm heuristics strongly suggests a malicious purpose.

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://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/6fea1476cfa306aa473f659e77215a08/pomotadek.pdf In PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/14252473008.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/d42def8c27bd92f127247006de049d74/rovidezipude.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/37743587629.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082efc623327---15625207760.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f17e8a17fe4---94159841569.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/41472146496.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/fa6ato37leqjc618h019uprfm6/26221974085.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfeb8c194a---69354014705.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/69215802078.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210510055718.pdfIn PDF document text
    • http://cropscipublisher.com/files/upfiles/file/kokipofifudiwitonuxad.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848bb9049da---vaweneleziwojanesokokure.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/86300412611.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/q5e683cfjp3pm2qmah4epbunps/37095588997.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894c36acb02---73401204789.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f50a0394f---39368821280.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/45375299432.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/a6c156401e9e492feee6681c2e6f0680/48310740795.pdfIn PDF document text
    • https://geniodelweb.com/file/giwonari.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/sexiguj.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbd6dbd93d---kovebi.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/waralosugopunovebixow.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b5bd1adc4---xeledaranepisa.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/nogibetinakafugoga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=do+i+need+control+solution+for+glucometerPDF 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_off0000f7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C7 10756 bytes
SHA-256: 38a530252264db0bbcb0918256966d3db5053c2ab349aec72f07045f73df8146
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 16992 bytes
SHA-256: 9ceeb6115511561aa0dff907964d41b6cbf08d36ff7c848b07fee270ba72e9c2
font_02_sfnt_off00013c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1