Malicious PDF — malware analysis report

Static analysis result for SHA-256 184e7153c213c393…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 03:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 31543e9e1ab5ca7a90da208b2fb784aa SHA-1: 7dec53f20689eb97d35901f6fb727550af85768d SHA-256: 184e7153c213c39360dec29a194b40eeda3d3312b77bbcdfa91b814fb936efdd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://konchris.com/userfiles/file/1630770961.pdf In PDF document text
    • https://ppntassone.it/dati/upload/file/kesedev.pdfIn PDF document text
    • http://tochalco.com/uploads/files/97473434807.pdfIn PDF document text
    • http://zubrcup.by/files/files/90928867138.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/zulufe.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139315639db0---7042050431.pdfIn PDF document text
    • http://goldia.cz/data/file/wefusatafajapododukawes.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/5138994856.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e5a528849---nipazovumizuxalekori.pdfIn PDF document text
    • https://maria-galland.ru/files/file/nimebuboxunuwazozositan.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/kolipekegotixukunurezovaz.pdfIn PDF document text
    • http://naasschoolofmotoring.com/fckeditor/userfiles/file/49451955129.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/909130563.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/govamimiforuso.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16136c95901f04---vufonedorevonok.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2g38ife2blc9k31dhh2remmgp0/36024284498.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8c8484a09438919b50ff54b73a875ce9/97371291872.pdfIn PDF document text
    • http://prmakeup.com/Image/files/porexivifixoref.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a2dcae79643571b662c1fd381a647219/jagadakovuwesukuxo.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/93481594753.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/52321605062.pdfIn PDF document text
    • https://santaclara.com/wysiwygfiles/file/86889878468.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s7sd8una9236it3q79bsut11v3/gifokezopebokazatinad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=minecraft+free+download+appPDF 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_off0000e095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE095 10524 bytes
SHA-256: a188025e0fcea8dab90fc21b473772ef698d62afa195bdc076ab1eadb8cb5c3b
font_01_sfnt_off0000f8b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B5 18464 bytes
SHA-256: 18c2f909c74b78111d0cb5e58517606cf9fc01d0a005f148b19028c7eddc8cc7
font_02_sfnt_off00012845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12845 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1