Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b390f22de79514e…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 12:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2812f5aac0e363595682bc1ff89047a5 SHA-1: 0a98ceb1d5efef9e71f85079a0568140717d23ce SHA-256: 6b390f22de79514ed0bc44ae0ca9d082d0f7b1739dec479bf26d1f02e4e0a2a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to external websites, including those hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these links. The document body is heavily obfuscated and does not provide direct user-facing content, suggesting its primary purpose is to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://etasystem.net/userfiles/files/vesoko.pdf In PDF document text
    • http://abwfinlay.com/uploads/files/wupigawivebisobifur.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/12878063656.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/tanofemuzozexalipi.pdfIn PDF document text
    • https://magatek.com/documents/file/kamaremijukizupamazolixa.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/97834464688.pdfIn PDF document text
    • http://azseal.net/uploads/userfiles/file/tozujadup.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133256c9765d---kopafotakon.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/kexipema.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/derunexobitukema.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/sipojinurarujoxime.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7d288bf8d4a58e63cd015f5cc8e7c524/67462516264.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/fejor.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/nitevu.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/xulezofi.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/51684287799.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/bawurijejuwoxuzaperol.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/paxatigagimaz.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/248dd5e93f6a5c205725f7f8e667b68c/wumopap.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/liziwufi.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/74885432678.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/lejojesisolomobiwovekulil.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/87188733921.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/sijiduzuduwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=organic+chemistry+formulas+list+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_off0000b4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E3 16196 bytes
SHA-256: 5e377c7a04530f01df6d753fb3615ead30950d6647b298e5e7439e5ce10e7706
font_01_sfnt_off0000de56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE56 11304 bytes
SHA-256: 135ea684d62b65fa7092947c1cf91e025e5f0783ca76d117d169a11c210fea30
font_02_sfnt_off0000f895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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