Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d580a39226df47…

MALICIOUS

PDF

62.2 KB Created: 2021-09-30 10:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 448eb035c2f995e0bf9ea0c643b955b3 SHA-1: 3903f96edf5a2dffe3d60bc6e58c7784fc2b1aba SHA-256: 71d580a39226df470cc75b22695e2790fd3c7f5b5f46e8db519ad304a4071cd6
154 Risk Score

Malware Insights

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

The PDF document contains a link farm, with multiple URLs pointing to files hosted on compromised WordPress sites. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. The presence of numerous links on disposable hosting and compromised CMS uploads suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6508

Heuristics 5

  • 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
  • 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://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615562becd973---neganub.pdf In PDF document text
    • http://arcstema.com/userfiles/files/79913855449.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/23805521414.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/fusavixodobepu.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/mugedefamazasejorore.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/57368731332.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16147ec1804c45---jutesitupakipifaju.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161416f8cd451e---dotakugamuzesuja.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/44684398814.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1614330c81012a---watajugok.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/xuzibetemafarakekabazogis.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/tulemijavax.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/94698880826.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/90216096908.pdfIn PDF document text
    • http://alcantara.cz/data/file/106090982.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/virasesadomakopitasug.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ropuzirebilalele.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/menitikukikirawuwemed.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/64966918860.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/45082831825.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16134004c5bf37---judapumavafovigivitola.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/73060124964.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/75843537843.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/20348804435.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/48fjav7k9finkqobudji6hmf73/tudiselejutofep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=is+31+a+composite+numberPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23A 14764 bytes
SHA-256: dd2abf15e344ac151c0033a6ed3d4554fc5bc55c1a3736d45ffc40ffb402c67f
font_01_sfnt_off0000d7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1