Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd55eec33312a39…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 13:04:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15a03e1308e522856381f60e30eef54c SHA-1: 7a7d98300d4b30a1cb4f29bb1e600bb7d7f016de SHA-256: 4bd55eec33312a39a52fe4cc9ade29179ba4ae712bf31d24e65eaacc14506025
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/faienhuusa7ur308hf0l4ak6n6/werujinefadejemomapu.pdf In PDF document text
    • http://sinoorchids.com/image/file/godomukekazamone.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/famekaj.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b6595ec8a92---vomejudobek.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/635bc6d5b478af30db4fa511853dd34d/6372595650.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b1c288be---rifozimupe.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6cd1150c95f5b5b7ca90c2b1e566c9e3/76087147039.pdfIn PDF document text
    • http://linza-market.ru/upload/files/76713534467.pdfIn PDF document text
    • http://hoggard1975.com/clients/a/a4/a43fc1111b7ad4318f8b553feb79a890/File/24088094281.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/zojowo.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/c50e15ea21c7e5e6cd68f7ec3dc57f35/kisibibevodozukosonasad.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/wuwuwili.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/40524212750.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/563e4ec88d81508f91f9d6f493101a1b/tenimoraxojaposiludo.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/bipelimis.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/xonefapekezerofi.pdfIn PDF document text
    • http://pincodehub.in/userfiles/file/lutibodiromidulujavovuk.pdfIn PDF document text
    • http://tillyardci.com/userfiles/file/bagoxevizelipibitupik.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/zasidofot.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f50db4e472---gojedijilujunuwebepulu.pdfIn PDF document text
    • https://baptistfriends.org/media/84088048296.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7ef138475---81813824897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=is+clothes+singular+or+pluralPDF 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_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 17964 bytes
SHA-256: 55bfb6851a2ba36ca7daa879439f9f0b037c5445048bcbfba6fc93b13d063876
font_01_sfnt_off00011b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B19 10704 bytes
SHA-256: 2ad6e9ce2e5af24f5c2d53681fa9bf39bfe69bcebaad4a3afbc0c65860bd81b5
font_02_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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