Malicious PDF — malware analysis report

Static analysis result for SHA-256 71655cd6ad97584b…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 11:43:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c5f13d575685931bdea45b59cd95b13 SHA-1: 7b3d4a5557c04bdfc13ba36c7de5d56f386f4672 SHA-256: 71655cd6ad97584b11df3d5d5daf4caba3fc2257aa51ce8b3ba68c2b46655981
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to redirect users to malicious content.

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 https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/36c18d85afd0aa39d60d8454fb7c1e2b/5635064322.pdf In PDF document text
    • http://maivietnamesecotati.com/uploads/files/89023638342.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/79601137259.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vubelereke.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/63720575441.pdfIn PDF document text
    • http://sushi-belovo.ru/files/vapuguvolume.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/a1861d33bd54782861cbeb13a02a1d8d/vinozetidofetab.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/78843490943.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/basekosofopeferonesoloxa.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/sufodotupigez.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/80741482861.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210627190552_111500.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad7c846ed---5410521109.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91455caf3---84995806341.pdfIn PDF document text
    • http://hermandadperdon.es/userfiles/file/fabipomunelisazural.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/supuxeripuzupurivoligon.pdfIn PDF document text
    • http://ubest.ru/images/file/pugosawox.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/penabuxurubiwurekuzimupiw.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611698958420b---47512057856.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/92905347519.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/posoxofenikugoraduwizel.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/20334086523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+greatest+showman+movie+pdfPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/26ef090cc60d44ebe68f81dd88c3c81d/23690701773.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_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B70 11012 bytes
SHA-256: cf8c7be7a974d3093bbc94c6006514d78b92c16778e35566c96c35e9d476bd73
font_02_sfnt_off000124bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BF 19060 bytes
SHA-256: 6f3cd552df91a1af649cc485b06c9f3d0d4eb69c855c05a9f9890071b8187d30

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