Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a83e258e17f85e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 04:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4f5d5ae1ddfe4193cb5c90c9f338b37 SHA-1: 773d4c0d3a6bbd2c055f653b765fe162bafa6f93 SHA-256: e8a83e258e17f85e73bbc9735c1cf00264102d1f0c10278cb7fe366df3b9239c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic findings of a 'link farm' and 'compromised CMS upload link' are key indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://414movement.com/wp-content/plugins/super-forms/uploads/php/files/b933290210eabbc44a6460497d8c3973/mebazusa.pdf In PDF document text
    • https://e-motorcycle.tw/upload/emotorcycle/files/87174670072.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/38276413073.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/475438965.pdfIn PDF document text
    • http://gotween.com/userfiles/file///54759121466.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/29249649958.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/72147687087.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/nigula.pdfIn PDF document text
    • https://media-get.com/userfiles/files/meniledami.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/rojuvix.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8c74e45f0---85637310725.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0441f63vtlrt0veaimcs63gn65/2105561608.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/rijulu.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/5318333196.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/ligomaxupape.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/rusegete.pdfIn PDF document text
    • http://paradisetnl.com/FileData/ckfinder/files/20210913_DD0090D5C12C6E04.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/mabir.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377c712f82c---gagamesapegixepofesu.pdfIn PDF document text
    • https://bunianco.com/other_files/File/fenojewowuwoleja.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/21e215c0b66cd3434192d27741d1ea1c/95800492834.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/94634776240.pdfIn PDF document text
    • http://timocomputer.cz/files/file/tarelib.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/85350602419.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_10_22_56_04_5561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=survival+minecraft+house+designsPDF 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_off0000b94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94D 15636 bytes
SHA-256: 28327da8a46fe5056ea8b359da8b0b83724838863c40c47a823b54403229a65f
font_01_sfnt_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 11164 bytes
SHA-256: 230ff4d1e71d7322499b88a8f40dae14384d984dc4fdc66a2a9a8823a1f225ab

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