Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b24e6c57df163d1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-04 01:06:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: db19c73df7f625e133595c01076e34a8 SHA-1: 97bba3919964ab10a2c932ca6d1eec470e3d0769 SHA-256: 8b24e6c57df163d1af1a63e74ce5a350f059ab65fd4949074a36e1df9486c283
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 or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=colombia+en+la+guerra+de+corea+pdf PDF link annotation
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/4ac927cc8a3862672b6e172cbc4a5314/17368592567.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bec76d0ebe---jisedugefu.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/12532563939.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/zezunapumuzuwobikakejo.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cec297bb49e---26064633064.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/69151545493.pdfIn PDF document text
    • http://mesterek.net/tmp/96088601721.pdfIn PDF document text
    • https://digireg.ch/upload/3625436758.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/c95afb072ad5d653a7698c99fcc0f95f/11896128312.pdfIn PDF document text
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/83937729543.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d88c06926aebb0c1eab3d20e550c4ebe/wolupekivi.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/kirile.pdfIn PDF document text
    • https://lasanisports.com/files/sifiwuful.pdfIn PDF document text
    • http://24cvety.ru/upload/files/82689439331.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/100222126500.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dasoxotevuduvanuvijebem.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/a6945f6d088c24ace3db60429ff33212/zebivazukanipojafowa.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d584d93caac603d957e90f8731cd7ed8/redaxupix.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16124995c616e5---29523786793.pdfIn PDF document text
    • http://ettorebelfioreliutaio.it/userfiles/files/kajatujabimalidanimuzoxed.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e88a59e2df5d23c3148203c8c34711ce/jirisewuvefakukisobejonu.pdfIn PDF document text
    • https://autopratichesas.it/file/17518903378.pdfIn PDF document text
    • http://westboroughhigh76.com/clients/b/bc/bc4984db1d461a603911d7e4814e3e59/File/11748597629.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcdb8d9a66---vusexizaza.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_off0000b3f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F5 16040 bytes
SHA-256: 277eb289f62fee4c32ae3102dc116cc1e3787c723c3692d25826dd76442af811
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10968 bytes
SHA-256: a4c03b1f9117c8df71f8fec29612371ba4d0d4537eb7519f2a746d674359899e
font_02_sfnt_off0000f587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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