Malicious PDF — malware analysis report

Static analysis result for SHA-256 52f41ac86ccc2b3e…

MALICIOUS

PDF

82.5 KB Created: 2021-08-21 13:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2b76abe109e784d48e281f14fd4189a8 SHA-1: 22915bef68cd9669932541a335e86d609a634464 SHA-256: 52f41ac86ccc2b3e9c5a6082fa5d97bce633f9635fb407934b8ae9351335bb94
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to direct users to external sites. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://philabc.ru/uplcv?utm_term=budwig+diet+benefits PDF link annotation
    • http://chono.mn/uploads/userfiles/files/lamilewebonuvij.pdfIn PDF document text
    • http://nebo52.ru/uploads/files/86835424058.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/4198173351.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/24692409899.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16070079add929---93097729975.pdfIn PDF document text
    • http://mylodge-naoshima.com/2684873418.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/90495028804.pdfIn PDF document text
    • https://12waktu.com/contents//files/94490441553.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/jdou22ift38nrf85t8mb3is34i/fifasamixemufozonagupono.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/21473759222.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075e54504---55264916408.pdfIn PDF document text
    • http://jplus-ag.com/upload/files/BodyFile__60EE05814CF71.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/fejawimavenopamakofo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ef8e15311---83576087626.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/2a8d19905a95f3efa2b2f6bb3861195b/motapugajurizujalesup.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/6b96c3bee69ecaeeaa0896d43b35f62e/rupav.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/jugijakebele.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a5776b22b---37045043293.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/b4d6db888229ac331d9ed2a96d666da2/57986172195.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/dixovikuzivevala.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3dedf224df---95220804341.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/tekole.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ce28c0b92054198cf27d3475411d1be1/86361104209.pdfIn PDF document text
    • http://minhanh.com/files/fenupegurasepetibexifadit.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_off0000e04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04E 10480 bytes
SHA-256: ccbfc8dfefd7f69b6815c74ceb083072d5182e253545c6955b05e2d2fb79b64c
font_01_sfnt_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 16164 bytes
SHA-256: abf30997045c0db38f55faad820f874b4f439a2399bf54babb21326e2ed9b253
font_02_sfnt_off000121f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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