Malicious PDF — malware analysis report

Static analysis result for SHA-256 bca4a3f77e3fcd8c…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 23:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 07a59745fec5fa7858951f09bfba6c99 SHA-1: 34851d6d6b74a11f577e122dd3ad8e75ad2ee91b SHA-256: bca4a3f77e3fcd8c16d5080d08949cb40d1ef28a6c6d6ddfb180b6a0b7ee9c71
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No specific malware family could be confidently identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://maintogelonline2.com/contents/files/gadetajujidipi.pdf In PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/2qnrthet0k45sqlskqmob1j0jm/xofusewufudasorugij.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161393a3aa65f7---vikukabegulakawevil.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/2da55b72f3a61813e8b5cf0aa58cd079/xexirerovimifokila.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/nebugitemanawimaxedibujeg.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd73989401---fovugirulurum.pdfIn PDF document text
    • http://badgerhillfarm.uk/tirugaxugitilufak.pdfIn PDF document text
    • https://matricula.netlandschool.cl/files/37085246762.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/tpq1k6eepf4iavi2u3bllbuqq1/85702361797.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/30699544699.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/bobowiroxaxekokurakevo.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/vuzupavirozukotefipan.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d02132c18---vidilugipajagamanizatip.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/tagokamotitud.pdfIn PDF document text
    • https://bbox.ru/images/shared/file/loregonirimap.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f811abe658---xonibewugupifiwuboxobelo.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/35877930449.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/94421499322.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/wemevikinisiw.pdfIn PDF document text
    • https://fivetc.net/uploads/files/dewux.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/libonepozetisotide.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/34020308702.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/24724065224.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134032545890---73478396361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=tubidy+mp3+download+songs+app+downloadPDF 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_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 16764 bytes
SHA-256: b45bd922b5c6ca7e3652c768e8b66e4f4687626dad2584bc2a6f868bf5953a21
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10980 bytes
SHA-256: 80c9b175a7228f9581c0a0ded1ca765a584497b7c4793d8c24b33655280ab7d5
font_02_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1