Malicious PDF — malware analysis report

Static analysis result for SHA-256 1030002aee7f2b58…

MALICIOUS

PDF

79.7 KB Created: 2021-09-05 23:57:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 623161808974e55111949cbc32a9a468 SHA-1: 37d127daf6fca1ace5aeae8dfde468260b0d2f90 SHA-256: 1030002aee7f2b5843f4c785cabd2730d3aaf7655e174bb5d681eb1ac623d89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of link farms are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://delve-cr.com/uploads/18987381584.pdf In PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fb5f5977f01cd79cdd8e9a7d2807b513/felixototowe.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3847ca99e---nupifobimoledugufijarow.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/28789492865.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16088cf9309c4a---45696354396.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/249b1fd60c5a3f002fc907674ed8c06a/77672601443.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/89353282528.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738ac584521---66203759761.pdfIn PDF document text
    • http://goref.ru/files/file/32946208062.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/kikubetijaka.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd997b2d0e---23970561104.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/bewupupakefemazelaxosu.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a79c652a---lepawi.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/26690711030.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845fa9e1f65---jugezojonumuwamenusugudik.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca347d6dd6---tagojipufebosuvanidisaxi.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/eke0j2q65r0hr4cokibo0q3lov/nuwuxufo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608634a34efe5---44989919367.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/gigunikaromu.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tufotomepuxotuxujapuvube.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/farinut.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7e5464e2e6163f4805238fcb25a75b6b/95490320433.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/latigevujidumaromudirobi.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/bolur.pdfIn PDF document text
    • http://cgemfoco.com.br/ckfinder/userfiles/files/fotixowedivofovap.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa1672073---7485021357.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=true+north+discover+your+authentic+leadership+free+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_off0000ce5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE5F 18796 bytes
SHA-256: e279e9c80dd17c03365722ddb102334a12c865163b9942238a10465a666c3e62
font_01_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174D 10960 bytes
SHA-256: 0c8bb808409ab67ad93ff52df31bddeb49944f65341c5a83f4c41ddaf9b2257a

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