Malicious PDF — malware analysis report

Static analysis result for SHA-256 327dd5ab8776bb1c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 22:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e8d4a4a0a1b309bc3a3aaf1080fa628 SHA-1: edf3e74798893675ebb80eb33ac4993436783a43 SHA-256: 327dd5ab8776bb1c2d349c737a5ade54220549f1e907312b9e965a42b26946cd
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. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or redirector to malicious content. The presence of embedded URLs and the PDF structure strongly suggest it is used in phishing campaigns, likely as a spearphishing attachment.

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 https://nomylo.ru/uplcv?utm_term=l-o-v-e+sheet+music+pdf PDF link annotation
    • https://upbfassadenbau.com/upload/file/73317807038.pdfIn PDF document text
    • http://duplisite.com/userfiles/file/34793176090.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/2a4192be436a30f17b120db2b1e210d3/14002093853.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4e1e4e43---5520895272.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/5rbnqrada8cd7safkluqnoa8ci/96763937240.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/rujefamusoboguterivoxoki.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/jetefazutaxemarofugikuzuw.pdfIn PDF document text
    • https://badoza.net/userfiles/file/niwade.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3991b4e645---dojadapirazig.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/9bb816e959417fac8b4235f7cafb85dc/bogojabazatela.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3264e7861---69443952137.pdfIn PDF document text
    • http://mobil-tech.com/files/nibapoboxabogobodu.pdfIn PDF document text
    • https://elektrona.cz/files/file/rezubanelafasofazamot.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9b493cae6---17180682676.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16085041cf11be---89939004455.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/60722054973.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/virokefirekodev.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608190691e56d---rediwi.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/munomenenilomimuzizodasab.pdfIn PDF document text
    • http://contelex.it/userfiles/files/wawizumu.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa26a1c45d3---tazawinupojupusidutal.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/nupex.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/a4adc31d23d795705e4f66537390b34e/duwigola.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/0d0fea9c1367ce8eb932b68a655077d7/fixodezexadina.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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 17916 bytes
SHA-256: c5bc5096c56eff407ccb34b91a4aba4922dc1f3ee6ddb4bb714e82124a2bc90b
font_01_sfnt_off0000ff9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9E 10628 bytes
SHA-256: 461653af59f8a0bf53759d5dfe2040dccd03ba4abef4ef698fcd16d24daac5f3
font_02_sfnt_off00011802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11802 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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