Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af675f26a78f525…

MALICIOUS

PDF

86.1 KB Created: 2021-09-11 00:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cd39dddc592d7d96f12bc923dff628bb SHA-1: a88011b822fe5fb3a902726da294b7f536c63b7e SHA-256: 9af675f26a78f5255f957f7f5728c5ba449b8ad21c99a53fe7cca893a9c1804f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised WordPress upload directories and disposable hosting sites. While no scripts were extracted, the document's structure and URL patterns suggest it's designed to host or redirect to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/jabumupa.pdf In PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/8cd483ff562e6c016ef65af60a800bfa/gerataso.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/5f15d97d9601061343c093676caad212/kevebufaruk.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcead0ef01---sosupejat.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/jujogagusakebudevuf.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/saxigusugemit.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ece20e65ea---73449287817.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/sagulofafe.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/bakerobadanakugisir.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9s15u1r6p5rjs33lvi5sic3erp/61247810726.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134aab683ed3---vajumefatadoditeba.pdfIn PDF document text
    • http://jfe.hk/userfiles/89498195973.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/47414049700.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/putavo.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/71209080922.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37613384338.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/puzikowigazakerevo.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/ruvezutokinifu.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/95399557830.pdfIn PDF document text
    • http://vpsystem.com/files/fck/20312077141.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gatugijavulufobedotovadi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161397ecfca148---39459676728.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/56691999827.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/vovabevabelulow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=peek+calendar+androidPDF 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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 10188 bytes
SHA-256: 9cd56ce35d5ad5b2ec33a03d0aa1d73133d77e9c14e152c4c182c9a711f0f84b
font_01_sfnt_off0000fb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11359 21472 bytes
SHA-256: 7501a64d79ab53a4d07afcbe4696667cff990e1f0ef8f2e2ca00e25894d3817d

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