Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0243fcc90fc07e7…

MALICIOUS

PDF

119.1 KB Created: 2021-06-24 10:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e53cbb2070bd79d5bd564a429b23820b SHA-1: 15807637f931047c7844ac77d3d9c432d509f551 SHA-256: b0243fcc90fc07e72dc1c231514e97b9b4ecddacb64d21d2cae08cd243be1f74
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://fallsplat.se/file/13849516637.pdf In PDF document text
    • https://ever-progress.com/upload/files/lanaxejibinaziminesoka.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e0afa56aa---gurizimamovegogujake.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/vawomatovi.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/webulogixubos.pdfIn PDF document text
    • http://quaint-house.com/zovubuwononizunonowixolaf.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31bee8374f---54185237023.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/c765c503133e5773b576362b25d97c86/98346977916.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607755a674672---fewoxixanatif.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a086b4776---28119377845.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/69637743748.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df3a9f36d5---sevujalijudefodakufomo.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b0ac3433fce07dbbfeb010cf800a95dc/vojufukigutosilesorekuvaj.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/1beeaa357602e8da9355ca2a0e5ddf8d/gupowuserosezek.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/26eb107d4baf6687a33888084cfc30d9/59297613437.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/86213532502.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/e5lulu76ga5seq85oihh0hgu0c/96667158039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=list+of+irregular+adjectives+comparative+and+superlative+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19218 5552 bytes
SHA-256: 4dd8bc17d16a3743289f07f7e8dbd06a3008ceafb29033f68397b7f8bb179bdc
font_01_sfnt_off0001a4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F9 12428 bytes
SHA-256: b943f4510dfe550457df05699b3d970194e1809db533089d411eb49ac61590d7