Malicious PDF — malware analysis report

Static analysis result for SHA-256 3737dd4b83811024…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 00:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3d5f206258d8d893d4adaec422a0a0d0 SHA-1: 56c722c76840b1e499b8464ca65ed079f869c3bd SHA-256: 3737dd4b83811024d39b9668bbc5250d6b3b90cad501f861d6de15f8d896ce52
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to various domains, many of which are hosted on compromised CMS upload directories or appear to be part of a link farm. The primary function seems to be directing users to potentially malicious or phishing content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://zpb-maciejewski.pl/upload/fck/file/rilasubawijidite.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725c4ec017e---99318000522.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607066fe632cd---xurifudopovalomito.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/mitusosigimewej.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/jagunenuw.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/jopenejidix.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/mijedejevaw.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/40778362992.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/afe8118f89b69b22850121f950033e47/xokesevibe.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/10849093481.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/funilijusilesefo.pdfIn PDF document text
    • http://speckrepej.com/upload/file/wozuvet.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/wejanodipogo.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/86tn0345stutkfbqakf24s0cl6/birewoxajufixabegubikobo.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/48e4e38960490b5a37e615148e38e8ff/xeratogo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160967eb0ef9e5---81616973425.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/48071639493.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/sizizurimirutuvemin.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16090a70667813---zataman.pdfIn PDF document text
    • http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/fipasazetowasi.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607149bba934e---balipixuvufeditawoze.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/35545533362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ley+de+los+signos+suma+resta+multiplicacion+y+division+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_off0000dc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC55 17892 bytes
SHA-256: 8bf9656fd2e994668e402d67ab421324c8185bcdb6f5ed507eda6742198b109c
font_01_sfnt_off0001093f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12156 11200 bytes
SHA-256: 7c8bfc986ca36ae47910584fdcb48ee1c554a6fc71b96ad6b9c6a72358c1c866

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