Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a87c39d51a6a68b…

MALICIOUS

PDF

75.3 KB Created: 2021-09-17 11:58:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d91829e3359815430051d7909f41d71 SHA-1: 1c175769f26c5e49a9a7c892a6b1e6faf740cd97 SHA-256: 1a87c39d51a6a68b5bdcd97d4c7ecf48f295a8ba093636cf9faf7b6b50166ead
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure point towards a phishing attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://hoilhpnqbthanh.com/upload/file/65402466325.pdf In PDF document text
    • https://heureka-cz.eu/files/60660696480.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/timaf.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/34871442753.pdfIn PDF document text
    • http://tid.vn/upload/files/doxuziwekivivipoxib.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/39971940874.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/fisebugaxenivekifajexewe.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/0f1bf4801d522216668314fbcf8cef55/zumapobokix.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134c14f5f510---12767150.pdfIn PDF document text
    • http://rsentco.com/upload/file/48913753595.pdfIn PDF document text
    • http://qlionshousing.ca/userfiles/file/9384925294.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/piwadokero.pdfIn PDF document text
    • https://chinese-wall.tw/upload/files/ronuviwevamarumig.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/9976287643.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/93165758372.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/89167043547.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210910054226_xey6zj.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/sazijonigixugapitobivabo.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/zoxoragezujazusuluwir.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xipam.pdfIn PDF document text
    • https://suadienlanhhanoi.net/upload/files/duxunuxo.pdfIn PDF document text
    • http://tzsunup.com/upload/83681807723.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/suguvuposedujewaf.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161369357ad64c---50556172226.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nalusado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=android+box+update+firmwarePDF 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_off0000c301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC301 16904 bytes
SHA-256: 4d96d7ec4b63084617ae70764e75144f3b7ca466bab5f666721be29f3e31b850
font_01_sfnt_off0000ee76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 10856 bytes
SHA-256: 0314f041ac6e03cbc62c8c7362901e02a089a16afdf2ddb17c41af7413cec335

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