Malicious PDF — malware analysis report

Static analysis result for SHA-256 3056363f7349ec87…

MALICIOUS

PDF

81.4 KB Created: 2021-08-17 23:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b7e061aa7149f628d317ef27b9cffa1b SHA-1: 8689d981a8a21c52723acde767b1f43da4dca4d4 SHA-256: 3056363f7349ec8700cefd59efc2fd63bd7590c772c269a114db0229b56d26a9
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rt6na6kdilc2i0j9p9op2140rf/zurenegup.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f9c67aa99---xevesab.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/93173603091.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d468b0e47d9---30238862513.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/39442333422.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/90574f07b482f8c99d30209c5af49d2c/zesasin.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/79700753165.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/tuxufukoparexigojaxur.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/60239262656.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/89329747797.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/gasewamesev.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/jqml4tl5jr0jqejmc6nnqfasr4/77341521601.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a3767ce57b---pobede.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/zejipuxabo.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/nukawu.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/85852603428.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d31b64ef76b---32140882551.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/751e87ada255f9dd87206da4d3986781/69480944759.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/xafidubarefixidedosu.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c687520cb6f---31656148081.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a794315ee32---paxufaneniwurububalalujo.pdfIn PDF document text
    • https://kamedia.vn/data/file/13837222660.pdfIn PDF document text
    • http://bscartridge.com/pic/padoxiwere.pdfIn PDF document text
    • https://ienter.bg/files/37189135344.pdfIn PDF document text
    • https://ibericadearmerias.com/file/gepula.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16111ffe759035---dazavefu.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e0c38096bfe418d9e2a08ed5c8964906/99994930471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+a+rental+termination+letterPDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 10176 bytes
SHA-256: 6b52dcb7b42fd6981fcdd310baa292458a967afb97918704c4d2dd2bc6b1b65e
font_01_sfnt_off0000f4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 16524 bytes
SHA-256: 4bfe40c89db0d629f7d956b715a21f2e3959479d0444d3ce92a56c64f68760ae