Malicious PDF — malware analysis report

Static analysis result for SHA-256 17dafc435a49ea8e…

MALICIOUS

PDF

79.0 KB Created: 2021-06-10 23:54:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 68cfd67a4dbdbcd7d7dd07c4e9995af0 SHA-1: b2945db0f6b8440fce91e3f5149b70c57b8bb014 SHA-256: 17dafc435a49ea8e7349131d6f57034818a0674ed0f6f9fb511d837ae879f2b3
164 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of a 'bloons td 6 free download' UTM term suggest a lure to trick users into clicking on these links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to deliver a phishing or trojan payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/uplcv?utm_term=bloons+td+6+free+download PDF link annotation
    • https://airbays.com/userfiles/file/xodotosuxutubugogonajitor.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/11052137843.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/2820804122.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/617c2v6sgkov6dokm2b5egv7eu/bixudazo.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/tjakl1b5ac0gvbgepd1e9f7j05/14964124704.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/tcet4f307th87ggtd5e185sud7/fegenipimasipur.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/25810395721.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ihe49n3m3afjthoql1bs3q9d06/lifarasozogaxa.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aec328b7608---11965939722.pdfIn PDF document text
    • https://ahha.az/userfiles/file/86610301365.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081e382edf83---titibiro.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/6367dec88d9786f8e7fdd17983b356e2/pupizuxidapo.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/73035a4093382566d06ca028471a1115/tekozuden.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/96084213301.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5107cdbe7c7f00e053966538191e1971/60355265343.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD2 5196 bytes
SHA-256: 4c394118424c511a0740e0358c22106063794a1288ee5d66bf549fdc9686ddd4
font_01_sfnt_off0000fd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD97 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 12388 bytes
SHA-256: 811f7335970f6c73b9b53ec8b466c9613081d9aea9feea19732d0deef0114a4e