Malicious PDF — malware analysis report

Static analysis result for SHA-256 19308ec090d9a16e…

MALICIOUS

PDF

73.8 KB Created: 2021-09-06 10:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 81a40fde69f1a181b77dc3dc04f4b47f SHA-1: 96eaf200a94309d45a7b4a2e0c53c9a986f97464 SHA-256: 19308ec090d9a16e1352644cd11971ae2713967609b781e0cd0f8e21561fec0b
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links, many pointing to compromised or disposable domains, suggesting a link farm designed to lead users to malicious content. The presence of external URI heuristics and the compromised CMS upload link farm heuristic further support this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lorofilmes.com/Uploads/ckfinder/userfiles/files/lolewamabude.pdf In PDF document text
    • https://angem.fr/userfiles/file/92005583307.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/36131000368.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pomirimoguzekokeluxamuw.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/50840134278.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/tigamowilegoduvidore.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/wagakujixexa.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/36629024435.pdfIn PDF document text
    • https://praktijkbinnenstad.nl/file/rimenan.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/14polje30vcihi9o83vkgvbpab/21854109473.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/94275181002.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/20123671198.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160850c862e5be---guromovobiberemezedo.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/gk21qrs7ssh5e9loor376f0m9l53m228/putemuzisegemijo.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/denafigafigupakukegowi.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/88842888797.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16071bdfd865db---zefupakun.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/88840659522.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/85793200450.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/r7achcfp1vb7j9jjs5dfe83562/59344062055.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/30920113.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/24163504130.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/63933749551.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/86737851310.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/87069467304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=wireless+electricity+ppt+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_off0000bcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCBA 10336 bytes
SHA-256: d2a2dccd39af9595fd325cbc1c7c1c5fa3d7146e13dac9d9ed49aa298a1c380d
font_01_sfnt_off0000d42b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42B 17636 bytes
SHA-256: 298bad94265b754fb709f93981fe08136375ef8472b5a729fe8c6145c6bf927e
font_02_sfnt_off00010150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1