Malicious PDF — malware analysis report

Static analysis result for SHA-256 30c1b5a181423f11…

MALICIOUS

PDF

74.3 KB Created: 2021-09-14 03:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9e1e53d6348ea4534e50e31d3cb0334e SHA-1: 1631e092d827bb0014fc83f319a790d49f3c77c1 SHA-256: 30c1b5a181423f1101b47c0f86f8e1234fa16fb5f4dd8ad77ff762b91c876a10
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics indicate the PDF contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c727bb458690d0e6b033377c6079470f/29210822232.pdf In PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb4ac0b34b---34307071798.pdfIn PDF document text
    • https://stormester.no/files/file/12961532287.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/74827719338.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-2/20210902040111427520.pdfIn PDF document text
    • https://fototipia.hu/files/files/65574288065.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/lufubukuvibopokekugado.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/78892532093.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cd53ab1f---tabozoseloselaguzasi.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/n6cl1kotousdh42u59gntak8i5/junetofuvajimalufedipak.pdfIn PDF document text
    • https://samsungdvm.net/upload/ckfinder/files/15834693372.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/21962407298.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd41578632---vojop.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/16261175022.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210913042900.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/47124719920.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/pilupufomefataxu.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/59227935208.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/dadekojitevaxebawavafu.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/vebadetekepuminutu.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/dosabazebibi.pdfIn PDF document text
    • https://mauspro.net/upload/files/54958902744.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/ganep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pokemon+gba+games+with+mega+evolution+and+z+moves+and+gigantamaxPDF 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_off0000b8b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8B9 11244 bytes
SHA-256: 7f80a62779f5803a276f8af3f6ea849e7214b542ba806ec9fa8c893b5cb9e858
font_01_sfnt_off0000d2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE9 18608 bytes
SHA-256: d61f8b7952d087d892c24c040cd43810373438cddfa7794bee7ba9f77e8981b4