Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9d9aa6d9e07f70…

MALICIOUS

PDF

77.2 KB Created: 2021-07-01 19:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4ba22dc560f19522fc1841a8e93f5a95 SHA-1: e884a9ce7e74f29fde5bbc04869fa15eea6401d9 SHA-256: 6b9d9aa6d9e07f70bcaf30a5f71d95b4600b126dc13bd4ca4a438be0beecf29d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to external content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://drafthe.ru/uplcv?utm_term=watch+eating+out+drama+camp+full+movie+online+free PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021062918515636.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d95e291c18---linamini.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/bogukufinef.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67e90cb74---91547214376.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/396d8f429f5fe5329d08946ac003ab5c/40918784193.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16078487b5d5f0---kejejanoguzigopabogojofu.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/54957561756.pdfIn PDF document text
    • http://fhs76reunion.com/clients/0/00/009202203981f132fd14d012a57c0fe5/File/xalodufu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bca17af4033---zigadiwuzupuwuzapoguluwi.pdfIn PDF document text
    • http://dgjst.com/upfile/file/48581235091.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/c8b448591e0b8119397293d566ba8586/gutajinases.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-21/20210521103240458630.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/25302758964.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/51925dff26892dbe640c9ee3c1874de6/47889265145.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c53b45hm2rgf12duf7mg44gp98/30414648837.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ebceeaf3f5ce6f53317739d2bc69cf0a/zizepojigukupaditogusigan.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/firube.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160726719afe3c---59798278698.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/kobego.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/s20a6gqfao1ud8kea9rffapng4/ralosogerujafexa.pdfIn PDF document text
    • http://summithigh49.com/clients/3/33/3334069ac8a672cbece4a9536eb221cc/File/31564123808.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/zudubodadosefixifenelut.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8696ecb6c5---vagimezurogox.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/5e9b9b80d93d68b86731f32997640b6f/41444697334.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/kozageruvobodutolovodazuv.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_off0000ca45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA45 16892 bytes
SHA-256: 7c2c90b0f7cfbed84e4e77907d4d7ce4f0a98108ce90f5758ab143c68d8c67bc
font_01_sfnt_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 11060 bytes
SHA-256: 24ca69f2f3b7806e6d36067a88b8535977d3c0145f0d3d144597b7cd52d833b3
font_02_sfnt_off00010f32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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