Malicious PDF — malware analysis report

Static analysis result for SHA-256 141d25de4560ab80…

MALICIOUS

PDF

72.0 KB Created: 2021-06-30 10:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f738e17e0ecbcd375e2c029a6259145f SHA-1: a3dec464b76f8bdb30cf5339f9e93545b8ccbbf2 SHA-256: 141d25de4560ab80085b4a4878b6d754bb7ddd2e61f571f4797abb5f4247b8da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, many hosted on compromised or disposable domains. This suggests an attempt to direct users to potentially malicious content, likely for phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://say-international.eu/userfiles/file/tapaxagubalugajesufasepi.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210622171036409.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/c5ff873711820f7db64a115b861fe32d/83538327856.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ce0d196c---80314480422.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/mamazofoxipigas.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/20800640343.pdfIn PDF document text
    • http://info56.ru/userfiles/file/66111537551.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/38373579491.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607852ad0330d---sifiduzazepiviwasokoriv.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/94e72111c47b2af2444a55a2b62c26ab/juvixe.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e30db1303c---dilirubejobe.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b9aef94a---39424503244.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/babipudisamenadod.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a31274cd57b---54943605763.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b10288a4266---detoremukamuxegatoxagitij.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c649c6e4fd9---wadebuduk.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/nebofupegilevomu.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/nsaucflkm6n6e9opasj3s3itp0/zejemug.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/sagav.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/lorulodisawevurat.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/4711740814.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/423f20a5f231a3af36ff801fc57f2289/25402424456.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/06/files/210616011534.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210602/file/16226066332048.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076a8a3a5eb2---fuzexiwotutemorowibux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=girls+in+small+swimsuitsPDF 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_off0000ba92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA92 10240 bytes
SHA-256: 0b53174bb9b4f997dfc052dcd16defdb74f80ee8a829e04a11d11cc84e7b3808
font_01_sfnt_off0000d18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18F 15824 bytes
SHA-256: 76c478a6428adbc76fb62d09ba465e1995df7ac5d67b2ad6bc26bb076df387a8
font_02_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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