Malicious PDF — malware analysis report

Static analysis result for SHA-256 023cc6645531c3ed…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 11:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 601f748750bcb03c686beee24b0c497c SHA-1: 756d405151ac4c2081a358f62307a582180f6fda SHA-256: 023cc6645531c3ed0e70fd1191bb8dfbe8bd63039b2eae2685e0262a5e2a6224
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with multiple URLs pointing to potentially compromised or disposable hosting. These links are likely intended to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://signexpowholesale.com/project-new/christianbook/upload_images/file/werofamiwudixujuzevuriko.pdf In PDF document text
    • https://eldorado777.ro/upload/editor/file/2811056369.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/81961310588.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/golanaxabisazesedaveg.pdfIn PDF document text
    • http://rasciindia.com/firetech/ckupload/files/46380821816.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/67551750137.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/pubobisajinexigirimeru.pdfIn PDF document text
    • http://e-menu.hu/editor_up/40389008406.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/runagopaz.pdfIn PDF document text
    • https://bkairconditioner.cloud4demo.com/uploads/files/zamenazigefedidolorobos.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/jomenige.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16139224a5a770---bivekavozozetumawu.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/wimobebepudomokon.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ac55dhroimcpd1h5plnms1ieo6/nasat.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9d0b61ac---dapovanidogebimiza.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/92473362181.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/lapiwamagifagujasixe.pdfIn PDF document text
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/18909199046.pdfIn PDF document text
    • http://khocabien.com/uploads/files/sejoboza.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/nimafuvitinazu.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/milufuxeluza.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161378abf84ecb---35012440247.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/sodoxanawegiwabaxavufir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=toonpur+ka+superhero+full+movie+online+123moviesPDF 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_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 17888 bytes
SHA-256: cbcc1bd1b17e9f34491b48f182b982e8e86fb220928536ce114a630a5dd55056
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 11088 bytes
SHA-256: ae6a1bede02f2d573b081ee2af78afca2ba40c472bf6084b56ced54daf6dc45a

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