Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f18f3c6e2d89275…

MALICIOUS

PDF

79.6 KB Created: 2021-09-12 16:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ff453a3d0e97ebe78053c1b882e491df SHA-1: 860fc4c16b746ef948fcd31b78313b2904c0ad7b SHA-256: 6f18f3c6e2d89275922ee47dc8ce3e860513b1b01ed74b7a8e7248ca0f0b8ee3
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the link farm structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://pinedafoundation.org/imageuploads/file/38625416406.pdf In PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/80170117068.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d62e44f31f---94556372075.pdfIn PDF document text
    • http://daltan.hu/userfiles/file/16929205055.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/wibejifepemos.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/68682533135.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/ecb942d2369ba98f9784f42c6d72ead4/lepemepigisikedewiniwoze.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/74973096883.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60768675042.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/46409269626.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/94045520195.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/24308032956.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c1bbfb30a2b47c13fcd5fa44859ffdda/gilewenawedurafudefirodiw.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/tutijonasuwux.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/dibizafib.pdfIn PDF document text
    • http://lahma.pl/_u/userfiles/file/fuxaloludowituxixukixaraw.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/69370239822.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/nofubadasusarexemesutisiv.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/90201079988.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/nesepaxavuxekepuworodisow.pdfIn PDF document text
    • http://vecsecity.info/editor_up/robebimi.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/jizipilimuropupata.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/nibisotumugogiv.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/panalurefodalodekoguv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=free+bucks+fortnitePDF 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_off0000d3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E8 17796 bytes
SHA-256: 31b3e882046c00f7d5e7239bfc3019338949a99b8f2190bd322c335b15ea0a3b
font_01_sfnt_off00010163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10163 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001197a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197A 10428 bytes
SHA-256: 78110cfe5e86c0552c274aabd77424fd8f4bf9f99e1b61a71fc71acb97310760

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