Malicious PDF — malware analysis report

Static analysis result for SHA-256 c76feccf563b7329…

MALICIOUS

PDF

86.8 KB Created: 2021-09-10 21:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0ef32661a2eadd52724e26e0c48c973 SHA-1: 38a2c6a93a2e66662df5290b795943d8d8ba0584 SHA-256: c76feccf563b7329f14a4aa3b886782f5e46ba898719355ec4d3d883cf8fb62b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, many hosted on potentially compromised or disposable domains, suggests a link farm designed to lure users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the 'SE_DOWNLOAD_BUTTON' finding further support the phishing or scam lure. No scripts were extracted, but the overall structure points to a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.logomarcanet.com/userfiles/file/31071884795.pdf In PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/xeronobetegulor.pdfIn PDF document text
    • https://laps.pl/userfiles/file/42481977981.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3eb4c9ab9311bd324b950c13a8462c73/gefewefide.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/45397901561.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/94888279055.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5e3ed73f---67736209184.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/garekawisodem.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109032245193079.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/583a3b5e5b1b963ae3e35e8f645a132c/morel.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gofuvekelidim.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dafinulekabezopabizalimo.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/nemulu.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/kajowatiziwa.pdfIn PDF document text
    • http://kustari.net/userfiles/file/90111288062.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/wiwoj.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/norogejejata.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/16057164786.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/sekodifite.pdfIn PDF document text
    • http://chongthamnguoc.vn/img/files/poxasofelalixudunejirofe.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/58221409178.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/jopuzanifilolunobukuridu.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/notugimazedigunelibazonid.pdfIn PDF document text
    • http://cutyoursupport.com/userfiles/file/74374853469.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/4428248907.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/89474567011.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dcb158b84---zefidot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=download+safari+apkPDF 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_off0000ec0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0C 19332 bytes
SHA-256: d62ee9c850a99c1e8d3ac1194ddcf6b18dd5428995c25616153dd1ff8c263028
font_01_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C0 10440 bytes
SHA-256: 78d0953cae0a9290c3ff2d5d7efc6aa5e9c230e3fe7ae818622d265e68bffc1c

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