Malicious PDF — malware analysis report

Static analysis result for SHA-256 48fbe6535f162037…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 01:24:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 05e85437d6d4d11855ef0fe00ff5c796 SHA-1: f844142e06826f016fbb4d06b31b71cb775da023 SHA-256: 48fbe6535f162037dc220e789c1f0f0c438e2d9c2672ec0314a4c4f1868394ac
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains an embedded JavaScript stream and numerous external URIs, forming a link farm. These links point to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=primo+levi+si+esto+es+un+hombre+pdf PDF link annotation
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/37078510516.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/vasixaxilupuni.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144fb53952d3---rolikebufunofum.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/30901193909.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/d06cb79e82107f14e6643b2d7d551b38/24403542525.pdfIn PDF document text
    • https://nobelboya.com/userfiles/file/8485833215.pdfIn PDF document text
    • http://csc-0411.com/userfiles/file/20210913173703_u4ocir.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/nigilotenowuzakevoxalanor.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/94975749303.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/62376089578.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/4625551482.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/32800153714.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/44620968949.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613344aa4ced9---tawekasulapofuwu.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/getekukof.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/vefisaridopi.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/55637823.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/jagizigusaguf.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/deluwiwa.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mubuxer.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/biwozozasonigen.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/rajurevolavozovokakosak.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/26554609171.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_off0000d7fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FA 10908 bytes
SHA-256: 9a9b1401573af4804714bfe4a82748777494d5c8c3fccdb0b48eb59e4a6e6926
font_01_sfnt_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DB 19688 bytes
SHA-256: 1bf4f31afe4a6fde68265daa29d1c556566a68ff706fc813838228285d3cc002

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