Malicious PDF — malware analysis report

Static analysis result for SHA-256 956c998575c32135…

MALICIOUS

PDF

85.4 KB Created: 2021-09-19 19:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: db10f94f6bbdc9c6edc92c4283d26ce6 SHA-1: 2cec557efdc8ee52918255b677cf2aac2b510caa SHA-256: 956c998575c321351d79f85a7d2f0f9f944a3b98d8fc25b53de78ad43174be29
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious payloads. The PDF also contains numerous links to external resources, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kingyao.com/uploadfiles/files/20210910_135827_2518.pdf In PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/6bf2cff6081a7b429196c796e7e652a9/zesiforo.pdfIn PDF document text
    • http://capital96.com/userfiles/file/5567940970.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/dimexilasubomuvijaxixixis.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/43b6c6bqbafimvppvjkfu6p94d/pumetatalabune.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16140e32e877b7---jutexupamabi.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134ae43bebae---69217548693.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/23407074100.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/24700664785.pdfIn PDF document text
    • http://cssh.es/img/file/6642904932.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rofiku.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/57501899620.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210910011649.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/94089468772.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/xekedawas.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/31467778181.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/pedugefij.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/92779647468.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/limapu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613eca1278ee0---39377819847.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/29395042238.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5770eae0b---mejefufukowamutip.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/33213150375.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/27066519518.pdfIn PDF document text
    • https://uetty.xyz/js/ckfinder/userfiles/files/gubofavasijafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bhagavad+gita+by+paramahansa+yogananda+pdf+free+downloadPDF 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_off0000e5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE8 18432 bytes
SHA-256: d4fa8e6bd0eca12066e0081ab822f87b50a2dcfd526b695beee58add90c3c19d
font_02_sfnt_off00012d90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D90 11404 bytes
SHA-256: 8dca44934c3c005d3160e232e235231901db4b4f8a7c0b53a968e4db1fe5a096

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