Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d626374ebd0746d…

MALICIOUS

PDF

111.9 KB Created: 2021-07-24 06:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 11a7d5c3c01a9581d9209127ac80144c SHA-1: ddf8726d0bff92d2812ef918a610d5da56bdf756 SHA-256: 1d626374ebd0746dc326185e6f71731180d30a6b7646906f73630115f5eed213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as a link farm hosted on compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

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://ailani.org/wp-content/plugins/super-forms/uploads/php/files/95bf45dae70fe7d0984aa71224188b36/nuxanufoliperaf.pdf In PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/sexelolajubanuged.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/debirewufi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160869d470f26f---gomakinaritu.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021071900463573499.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/61410078106.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/mixaduzedonolepowe.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/79776101873.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/72955534255.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/bezusizavipoledifiza.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/53981324063.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/wodisukukasigisiku.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/8217def82d9c5755198bfd5992be6a45/kifojinegatatutijekifo.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160949df006ac4---lujotawotomovik.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/luvopisal.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210605133350.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f9aba05c3---69392482790.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a22d1f1f149---goxipo.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdb2f579ff---vowutomudumofepisuruxemoj.pdfIn PDF document text
    • http://thediamangroup.com/_images/files/dekemegebuzinajufisozo.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/cu4lj1a93s78hg8kvm88i9icc3/dozuvew.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/ee4ed46e5a3e26e2818152d2e26670b6/86834421396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=can+you+still+get+minecraft+story+modePDF 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_off0001517d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1517D 17928 bytes
SHA-256: 758874496a293c0ffe7d945ed79da6f19f23510fac654f06eca19408d00f995e
font_01_sfnt_off000180eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180EB 11064 bytes
SHA-256: 4aa8d89e9927d08ed0a5755a3e147f3562c68878e34d5394ee2a1b3c3633c45e
font_02_sfnt_off00019a92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1