Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7cca4230c514b2…

MALICIOUS

PDF

85.1 KB Created: 2021-09-06 08:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a7450db6eedf307c7d12e6341484ec2f SHA-1: d14f4ca1e1644a219670a8ac96a8c23aa68078e2 SHA-256: 4b7cca4230c514b2c16da91893fcbe80cb2a657038470900809a2ca6c9ec4b1f
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, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farms pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://crewmak.ru/uplcv?utm_term=fallout+4+download+mods+manually PDF link annotation
    • http://quinta.cl/upload/files/kasujijumigo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608564a11b864---99264371887.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kekarapoge.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fca5c08f9---11101776335.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/0a73af016cf66b4ecb831ef7924bc2a4/69570599792.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1610d35878c515---rukojatuno.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/s1tn7rd216mg1rkk99amdk5le5/fanumiwo.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/nobedebaxaz.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/78576987231.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/dutumip.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/segexavigakewofajesewigu.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303f725d8d0---3246365517.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/67215690735.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/kusitumaf.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/45592927067.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7eb878e46e---wigosebojorutaruxovividow.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/9chmiv3sk79f55j6tlbvrmmigj/28539661740.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a1266cf853fa8e0dee174c2e2949d9e5/xebafepelefabojekiw.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfb9f19340---kitadawajolixoberosa.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///poxigowidapure.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/74892395332.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_off0000e6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC2 10440 bytes
SHA-256: 689fb5b406f20b8ac7e785dcf0eea5afe958588cc390c34c66f8189a25d2ab9b
font_02_sfnt_off00011689.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11689 18680 bytes
SHA-256: 48b69eb9faafb4bc200e64f0af46e66b2de3c757d3aa1222258f06917bcd32a8

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