Malicious PDF — malware analysis report

Static analysis result for SHA-256 b560a5b6e5decbe0…

MALICIOUS

PDF

89.2 KB Created: 2021-07-30 22:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94e6927d28bdd177eb9a71a66c55b17a SHA-1: 818d113c70a43528aacb775cfebbdc150c2ab9c5 SHA-256: b560a5b6e5decbe0cc7d5ab6fe34249ce61318f5cf5e3eeaa1451af9831eea25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm designed to redirect users to other potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/6b3a957fbd5683e56b4489cad6d71576/80409357551.pdf In PDF document text
    • http://accronline.com/userfiles/file/mizowobonasozibagu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/c1f7b03e663a72b08704edca7b5d85f5/56295427635.pdfIn PDF document text
    • http://charnafamily.com/clients/60216/File/8056737307.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/6928225306.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e79aeb4fc6---zebugamapediz.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/jebiwonutux.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/tesubusafas.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/vumivo.pdfIn PDF document text
    • https://carlojans.com/cms/file/59666501341.pdfIn PDF document text
    • http://beiks.info/public/file/kutogaxiwavizidatokim.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/fok3s0v4jep79bbpdeg1b2qt7q/44554309633.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0ae52c229---tixiwu.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0680770001625659604.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/pofesufaritumu.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b476a55bc4a---67655078618.pdfIn PDF document text
    • http://pronobile.de/catalog/file/lemaxukugekinozinifiselig.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/wurinexugubemogatovatuga.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790d1e83e74---14115892298.pdfIn PDF document text
    • https://hssanesteban.cl/files/61249880122.pdfIn PDF document text
    • http://www.chubsorn.com/file/files/zatefotiman.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/vakefor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ejercicios+de+numeros+cuanticos+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB3 19728 bytes
SHA-256: da4160e3f264a855443fb882f3a0ac7747489739bd17eb26724f6564d6fb1bc0
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 10948 bytes
SHA-256: 2914beecba93f6abc3ca3bd3c93add89b593cbfe94f19867b13cc20b8c9093c0
font_02_sfnt_off000127ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CA 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off00013d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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