Malicious PDF — malware analysis report

Static analysis result for SHA-256 3682016cc2396fe9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 02:09:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d649f1ab51f9a427c830a0381ffce9ef SHA-1: be3595b998396ec03fbe4d2b3ab8afd62a08fe8d SHA-256: 3682016cc2396fe9169af232e4b995e52812968145acfa82b9e71c085cc71398
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Heuristics indicate it functions as a link farm, directing users to compromised WordPress uploads and other potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd5584a1e4---kifenazed.pdf In PDF document text
    • http://www.medicellbank.com/userfiles/files/lamum.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842ee226caa---wazomeval.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/44825077618.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/96324489627.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/fd0224b1164e79c3995b677250f8d313/41197329602.pdfIn PDF document text
    • http://ttc-investco.com/img/files/pefidopuzegad.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/46d5eef483c7b049eaa86a5523264e2b/2015152684.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/kobujofaletubejazo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/40559666427.pdfIn PDF document text
    • http://saens-jpn.com/ckfinder/userfiles/files/71821973578.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/94659260351.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/wikakar.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/47811626945.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fe09c9c03---fuzowike.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ae4414847---77696582810.pdfIn PDF document text
    • http://hochrainer-elsner.at/upload/files/87593791237.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/34632102625.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/29854489538.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb5e5645a---7266100534.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/38903784205.pdfIn PDF document text
    • http://davcpundri.com/css/file/linewodilemijumugoxazase.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=toshiba+blu+ray+player+user+manualPDF 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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 10736 bytes
SHA-256: a3a4ab7bf97d2cdeac0af9e7511ce9b8040078e27f4b7574cfda7656bbf327ce
font_01_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 17608 bytes
SHA-256: 9b3cc4344a25220ed6034dbe9b9fe76dc0bfdce1f7a27c0985651f6b1e461833
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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