Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b06cb6bc8ded5c3…

MALICIOUS

PDF

85.2 KB Created: 2021-09-03 10:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 35c41d8ffbc20522f638dc33c69f549d SHA-1: f28ec776d05653db010f261f6d7d208dd0957e1b SHA-256: 5b06cb6bc8ded5c348e215e4d28e073d0673e53c83261849dda87b9b83322bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristics indicate a likely spearphishing attachment used to redirect victims to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/953ca1d4f4cace3baa3c627e22761a50/92427020794.pdf In PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/d819a3bd18adcccfb26664781adaf2e4/35702406269.pdfIn PDF document text
    • https://digireg.ch/upload/54385983141.pdfIn PDF document text
    • https://ancoraeducacion.com/images/fubixat.pdfIn PDF document text
    • https://ferropula.hr/files/relisejokotib.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/bonikimozi.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114fbb72f71c---24983801892.pdfIn PDF document text
    • http://ahchala.com/img/file/subebab.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/torotibiwo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/jofodowekuk.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16086b532d03c0---voladunafegigajev.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/92844230370.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf87a26c---96702036764.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086e7de9cc04---10180979428.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d6c9615e---49396491609.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/jezedanivopamiv.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16102d1d53648e---wowotafozibulere.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/69359809836.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/2284e3fcb8c3bc1898be66a3584fe572/36166188786.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/74be9ab29871cbc405bb7559f4c698c7/47694914512.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0253b98e3e---10759365604.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/pufemerutumimufupafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=lego+death+star+10188+instructions+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_off0000e271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE271 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA83 18476 bytes
SHA-256: 49429aca05bf8b4ad5bc641dac52f1e0af645da0fdec5b447d4073bfa5169834
font_02_sfnt_off00012b32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B32 11292 bytes
SHA-256: 977a35a9683bec44459916ce6f1167fafa510727718d7efa428ecad7a43e0651

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