Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8f26a05fb30a9e…

MALICIOUS

PDF

78.3 KB Created: 2021-09-19 12:05:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0e28b3b6af331d0d489df4a80a26b40e SHA-1: 0dda3b9a99b7574a065385e86c2c4ed0787a0ff3 SHA-256: be8f26a05fb30a9ea209c22591b13124e24698b092f19bd8b05823aad6efce2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous external URLs, many hosted on compromised CMS uploads, suggesting it is designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://inwebjor.ru/uplcv?utm_term=boruto+naruto+next+generations+190 PDF link annotation
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0dcd2cb5f---73507208045.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/86822512807.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/xepewifubejuja.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/bizigexi.pdfIn PDF document text
    • http://yummyschool.com/_UploadFile/Images/file/33982216055.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/69357306415.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/pikafavumonivu.pdfIn PDF document text
    • http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/neratapopaxizovowefamode.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/desatilixanitefi.pdfIn PDF document text
    • http://arucax.am/user_images/file/bugulivir.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/83895621530.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/11020111628.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328dbc574ae---wujovixowolura.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/gavibonaropesumorogurozuz.pdfIn PDF document text
    • http://didopack.com/files/49644394405.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/lebevizetujufaz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/4efv77258jsqb37h6f4qb2bm0k/kerodaxuleve.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/nozabise.pdfIn PDF document text
    • http://state-lithium.com/upload/files/fokot.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/5e21f04a74aca132150ed8e09510f1e5/zezitovipesajimezatukov.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/ip8uapco4afjtb83ik3ngjfd50/debofojax.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/49459473108.pdfIn PDF document text
    • https://kueapem.com/contents/files/webelaxesis.pdfIn PDF document text
    • http://thaifilmind.com/UserFiles/file/42125465817.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/82554632998.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_off0000c831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE043 19280 bytes
SHA-256: 8c1a95b7221e0fb4de0acdb4dcbf3349b7920db4640d10ec95667005f9a46cac
font_02_sfnt_off00011264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11264 10832 bytes
SHA-256: 1a41043ae8bcd6be23a9316de7a5437799d121e7e72af6bdb4646b491aa696b4

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