Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1b0755d37ae111…

MALICIOUS

PDF

89.6 KB Created: 2021-09-13 19:47:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4bde71d9a0de756dedaf103c7e968898 SHA-1: 944166341bde1c7753947aacff1f4313f01334e0 SHA-256: 1d1b0755d37ae111d8314234d012574c4d9a4c222597efa76966738405cecd6d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. While no scripts were directly extracted, the nature of the embedded URLs suggests a phishing or redirection attack, likely intended to lead users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://np-laser.com/upload_fck/file/2021-9-3/20210903032241929186.pdf In PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea79c9e1b9---1065020949.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xogew.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/11202017454.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/xixubimosis.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/84273641726.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/dufof.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/27060448332.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/sekajokuxofinolotudax.pdfIn PDF document text
    • http://yuha.be/_files/file/zatosixemoparolukewef.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2adb32c59---tadubaxorutaxonoxapugafef.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/loverepev.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f25a800994---38193785573.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/50619822976.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0be85b498---siruvapazodu.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/da78bef2a36c870f53bef9ab104447f0/73087857421.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/sisipakaromagibuladeg.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/gokufexojikafoxekikipevom.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/3711459407.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/wafavisene.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/84409462847.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/doxufilepokesubowubiba.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bc6osjc8gdc90apu2idqcfool2/14315886627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=los+tres+mosqueteros+pdfPDF 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_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 20296 bytes
SHA-256: fe442586dac2188f7ca248e85c7bc5bb9e1d3807b4307137ac13cf82c7c9997e
font_01_sfnt_off000129a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BF 10460 bytes
SHA-256: e8e48d01709cfbdac1498cc5f7342e4d6c4da6acd001c429906e9fdd8827ae1a

Open this report in the interactive analyzer, or submit your own file for analysis.