Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b57a3a7feb47b9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-08 10:04:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f3df3bd91c72f60f8d3db82bf1a16d31 SHA-1: eba20811aa672d87753da6428cf130aef0b8f2cd SHA-256: 09b57a3a7feb47b9fcf4d4251b917eb1d60ea2892b22b8e5c3ad84d37b8e1877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=definitions+of+communication+pdf PDF link annotation
    • http://slovbau.sk/test/userfiles/file/nudemodiziwajixu.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/tudibojedudimodasofusux.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/59403370179.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/onnfjefoqanfmuarsuhmgq38oo/11551242296.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079454276539---zewajadurevikirevapez.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/rokoxap.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/30e217d3ac65211cf411a89e750d296c/vulagupifekagibixidepu.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/48986794961.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/6705vf064pg59sr7hip60pg7kq/guvadesevawud.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/037ed7d0217533243dfe105a40f5c6ad/30796417699.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/difesamagow.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/dp7v8a0jo8d257qvkv58r4sjl4/wurasaxuxa.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/2e08865d82fc992061be30bf6eef7616/9748417981.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/b9243d96a3f7e81c6979614de9d5d2df/jimebugesikejufeb.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nudiverubopiregawukigilod.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/31694498245.pdfIn PDF document text
    • http://amandamaitland.com/images/file/kamapegelo.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c55436fdf---marilijiwawawarakez.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/33268165048.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/32586884699.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16081f2050b575---23519084935.pdfIn PDF document text
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607046e48b834---pofilezebevudajowafon.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/b21c0c80b794b9f8610f179a9e74768f/jevoxamobebirakigasugadi.pdfIn PDF document text
    • https://naoshima-habitant.com/sazuwimifixodamejusometa.pdfIn PDF document text
    • 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_off0000d5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E8 10736 bytes
SHA-256: a3526474ab80e3fac2b6ad4f2e672c078d9527e975a9eb8962fd97cfe43017a1
font_01_sfnt_off0000ee9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9D 16236 bytes
SHA-256: 3c3a4caaff9915241176d90ff67e0ed237b4f06910891483ffc5a1ac0891e26b
font_02_sfnt_off0001183f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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