Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c57ce67b89f9276…

MALICIOUS

PDF

87.6 KB Created: 2021-08-07 07:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce3d74d93e06e18fd889227630892967 SHA-1: 4eba3b5a3035b66626e9ee7df624b6d4275fabcc SHA-256: 5c57ce67b89f92768d85dea514b37b1d17f64c794e4cfe9b40ea7a51ae847ace
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing 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. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=what+has+a+higher+boiling+point+ch4+or+ccl4 PDF link annotation
    • http://boothbayharborshipyard.com/userfiles/file/wijevukazujezubajax.pdfIn PDF document text
    • http://ylgems.com/file_media/file_image/file/nalofiwir.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/dfa3a29a824e3a0cfe24ab9a272be517/vatibarabepuvadedid.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/l25jfkri4g5971ngrfdn93gth2/58091795033.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/k7c7q6h8qss8igvtb6m0v81uc2/vilufarusegejerija.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/73298010092.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9a27bc3fc---85028578549.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083129db822a---86705837428.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f7a7e6391f0---jumuv.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/460788b151155229bab8e0595f96fa55/lezupekezabanurijemisisu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607188c19cdc4---suzikaxadegewopepajowo.pdfIn PDF document text
    • https://ultralloy.net/upload/files/314684744.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4ad217a23cfdc859be99b86850ed37f4/51901873822.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/c67cdae0f176a63c84183413b767b591/sitofekonilubefuravonejar.pdfIn PDF document text
    • https://ideaoneinteriors.com/images/bulk_images/files/51468851495.pdfIn PDF document text
    • http://kurskodkb.ru/page_edit/_samples/userfiles/files/55832086801.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/23uh0h8jf5a10eirq8c4mau0fu/gegires.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/wevirugupivelotav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609af97470eb2---tasifutikunejivubulirejus.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/43832460385.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/53736736045.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b365eceda4a---9071169142.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/rixajisojajulepazenaj.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_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 18244 bytes
SHA-256: c5906537a56ff1735feed2821c477037adaf7352b52d6d5a9367890bbae08144
font_01_sfnt_off00011fad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAD 10864 bytes
SHA-256: 8fac37bff86329368ddb70af9d37d4abdf7274063c102bfc412de0a4d4579788
font_02_sfnt_off0001388e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1388E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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