Malicious PDF — malware analysis report

Static analysis result for SHA-256 b544ac23dd9b5661…

MALICIOUS

PDF

78.8 KB Created: 2021-09-20 05:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9ebae873c039f6384af6bfb087a9a8de SHA-1: 10d72a278fc9be3b37a11be69ab111032922d6e7 SHA-256: b544ac23dd9b566195b7eb702b886ed7af1f12449f7b7e306a7cd74c2f13bf19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a link farm with multiple URLs pointing to potentially compromised CMS upload storage, suggesting a phishing or malware distribution lure. The presence of external URIs and a link farm heuristic indicates the document is designed to redirect users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://fbrasil.com/userfiles/file///26060586694.pdf In PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/2409437607.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210903020300.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/1d832d967b21065df02c629678b300dc/fivabev.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/578d27e3a722e11eff77a4cafe741c61/welawuxep.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/46805765150.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/texazomikizewetaxo.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/vozawidaz.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/nolelubo.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/61565313444.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/tasilezagezimabonuge.pdfIn PDF document text
    • http://state-lithium.com/upload/files/67365464744.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/kipimiwinodufi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/vujiteda.pdfIn PDF document text
    • http://backupcenters.com/userfiles/file/65435723748.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/ginezeviselimunofuse.pdfIn PDF document text
    • http://cwesp.biz/upload/file/bofitulagosapepulo.pdfIn PDF document text
    • http://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/momowagisozepawunegemet.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/98316660598.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/87200551698.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/97460899394.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/32260279172.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/da03f2a886e15be30406054c424e70d8/figevoligabiwepolivolekum.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f400fd2944---mijagugolepelewexu.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/pevinosofab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=go+goa+gone+full+movie+watch+online+free+hdPDF 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_off0000ce95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A7 17552 bytes
SHA-256: c22967806cb3ebc6ce70ce5131f7986a364fff27fb39c98ba62349b75d936863
font_02_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 11048 bytes
SHA-256: ae0f6e852d3f6073b6d725cbf45868d900cb2d0dcde8f31fb96c04f2519722dd

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