Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd15dc11dafcf058…

MALICIOUS

PDF

86.6 KB Created: 2021-07-07 06:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e2f483f61a36715d6ffbe23042444ab7 SHA-1: 55cc85e83d669ada68bec6cfaa7c92b328cb8ac0 SHA-256: dd15dc11dafcf058be500e85580c2ff19dc2cec17a89fa321205d9e410d31698
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure the true malicious intent. The document's structure and the nature of the URLs suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://studio45.live/wp-content/plugins/super-forms/uploads/php/files/p4sinam0obdpuvjsc8002f5m09/35498361874.pdf In PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a2f1a70e01fd457a96bded6990e9d819/velesetebomupux.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/hju5jtl0m0lctmb8r110ll7m3a/vamezedi.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/4429425396.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084fc72c2167---gemetegepevukodi.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-3/20210503144410564342.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8149d43232a8b93ef8228153038a6780/45324911156.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9637700ab4f369026f8b16637b2a7f9d/43377366470.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/wixazasilufi.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/gonizagozajelokifitileme.pdfIn PDF document text
    • http://crackershrimp.com/file_media/file_image/file/62189355353.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/49375645297.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc610e0fab1---29141451422.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608333af8b8a2---favanapilopuwobize.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ac063fb23825ebbbe8710cf5524e0472/mikijarekifudevusovadirid.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/ganav.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c78dcb26e2c33a4bda1c60a7c84fd504/puxatoj.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/71670657515.pdfIn PDF document text
    • http://unsersohn.ch/images/file/sexovezibadolomiza.pdfIn PDF document text
    • http://asustainable.com/global/file/54598316018.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/31986807258.pdfIn PDF document text
    • http://qa-whg.net/upload/files/31067581030.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b77168cd466---58246316439.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/60659394643.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=spyware+who+came+in+from+the+coldPDF 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_off0000ee0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0C 17352 bytes
SHA-256: c27a6910edc1cc98839f4f67d1166429ca3892703dc0aed03c2d9b0b44e10f6a
font_01_sfnt_off00011b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001339d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339D 10992 bytes
SHA-256: 7f699bdaed93f1db7e9d9ee60613dea03df9d8b64dd556d6329b3a94fb417084

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