Malicious PDF — malware analysis report

Static analysis result for SHA-256 36d2194df24250fd…

MALICIOUS

PDF

104.9 KB Created: 2021-06-23 04:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6d1efb2ca9de38a32993d834c219c288 SHA-1: 2cad691fb365c66028bf1200b1f423c766c64c6d SHA-256: 36d2194df24250fd51024fc905b9fc38b9a2499b2590966f197c19f9b8f5a165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to potentially harmful content. No scripts were extracted, but the PDF structure and heuristics strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/40mb9frsbf8pmto5ktfpaqvu8c/35852544947.pdf In PDF document text
    • http://abacusnancy.com/userfiles/file/wafususajuso.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/nigabixizizofezunibejilal.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/vadap.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160962c03757ff---25124787319.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/aqb151jc1rmkj6l41mfa6ufeg2/xigowofobudedumepisolupom.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/4294462203.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/adf398e6fe08988c836cf497d13a2f0b/81398963230.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adb2abd2cc6---51982643829.pdfIn PDF document text
    • http://archimax.ch/dynamic-images/cms/file/tafapes.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/2c321c85d1ada0d31da4ef1021ce0e6f/fekulezile.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/63371702566.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc27e2166a2---vatumakulepaji.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/18238850167.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/42029290790.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=picard+iteration+examplePDF 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://scripts.sil.org/OFLIn 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_off000142a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A0 5112 bytes
SHA-256: 207be7c48f8889ea950d497f9ae6a929b9cc3569e1bad3681e52a3064dbabcdc
font_01_sfnt_off000153f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153F2 13188 bytes
SHA-256: e3234ec13b59e6b84f545cba571b08a6279a4d9189fb3a14ccd960c75001ffeb
font_02_sfnt_off000180bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BC 16236 bytes
SHA-256: 65277eb52e0458411e1112f9ccd57c7341630130ccbac34297c4890128d69190