Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6fc568ff476f7f…

MALICIOUS

PDF

74.3 KB Created: 2021-09-10 15:13:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6f0f3bb80b0ac0d7ee4e9b44e75fa698 SHA-1: 3cd43d8efd9a892ac22916b463b2d96ee95780b3 SHA-256: ed6fc568ff476f7f05b5f7db76975884868b2295b570c3be2e35ff98f00ab1e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics further supports the attack pattern of luring users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=bareilly+ki+barfi+full+movie PDF link annotation
    • http://glamour-nsk.ru/ckfinder/userfiles/files/58605724445.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/34459647444.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/lobegitarewagepevaporima.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/91314674944.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/gafizakor.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/44504427744.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613074a1dcaa7---1458070969.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/33541144182.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/12922178198.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/gojaxuwezovuben.pdfIn PDF document text
    • https://iohrp.org/f_files/files/duvurudulapolofi.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/vaboxew.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/56650424773.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/cdqrbb7qu1qs7fpj0f5k8i4hta/wogonuden.pdfIn PDF document text
    • http://topstec.com/d/files/54726628537.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/suganinorodogutovewi.pdfIn PDF document text
    • http://wernitznigg.at/files/xebutedurenomufamarag.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/losejibe.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/51260824555.pdfIn PDF document text
    • http://wernersuarez.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94190523238.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16131fc0ca9382---69016665993.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161325d3d7fcec---70649366040.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210907235524.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/7744623564.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/lh4uds53nbpg7l66qkojvmrh0e/paxesedofalixovavokidax.pdfIn PDF document text
    • 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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 17364 bytes
SHA-256: 555a56de0d7eb74a432295196e77f77f06149250b4d1b7002e1e507fa900bf57
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10572 bytes
SHA-256: dd40ea5175b0a3a9af52f6f9603d8654110539343aee356bb2e49ee9cc22e93e
font_02_sfnt_off0001031d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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