Malicious PDF — malware analysis report

Static analysis result for SHA-256 f48df9d4b5a821f5…

MALICIOUS

PDF

85.8 KB Created: 2021-09-23 22:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ed2c3c638bbbadc88058b0c3c91e3589 SHA-1: 23bd70c45cc4bb171ac778cbac56b07622728727 SHA-256: f48df9d4b5a821f5c8b00aa0b50bb3cc6634661533aa861e90f2f138b79eb5dc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to exploit vulnerabilities or download further malicious content. The presence of a link farm pointing to multiple PDF files on various domains, some of which are hosted on compromised CMS upload storage, further supports a phishing or malware distribution scenario.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • 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 http://cuakeobinhduong.com/upload/files/34082815631.pdf In PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/mjauncflhgmji0bo8hrp5kr1oe/buwenexamikusizawuzi.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/7199878763.pdfIn PDF document text
    • http://chineseclothingonline.net/File/zavilevomokawa.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/muwelupobabirixarezur.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/99453407414.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wedifakujiravorakej.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/94500128606.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/sofagezinimalunuzakoxab.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/kofilupozojofevirat.pdfIn PDF document text
    • https://serka.com/serka/upload/files/fipuduva.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/50666298718.pdfIn PDF document text
    • http://chinatriage.com/ckfinder/userfiles/files/51718890993.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/noxatanojukubukawuda.pdfIn PDF document text
    • https://people11people.gr/uploads/File/19441750768.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/mubomop.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/kuseki.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/kizawebijamikiju.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/64004983340.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/92847474236.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161305501df658---kumanigopilob.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/98e715d5231dcffd890b915d3445cab0/doxesuxivuxadebos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=watch+365+days+movie+englishPDF 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_off0000e7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FB 11364 bytes
SHA-256: 179607aedd510e6b4be50b7a356bcb34ac99a56aa6a64903e98ccc0b7d63b659
font_01_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 18176 bytes
SHA-256: 77003abdd3c6926f89c6228c07618906541c34c7e599b27ad0eb9035990beaa4
font_02_sfnt_off00013191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13191 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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