Malicious PDF — malware analysis report

Static analysis result for SHA-256 d702ecaed27a6d69…

MALICIOUS

PDF

84.8 KB Created: 2021-09-13 14:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ee15e74a943174e86044bb4fc485f36 SHA-1: e65f9449b91b90fb466a3a6c8892dea17c9873ff SHA-256: d702ecaed27a6d69f97e46a4108c3ffabf17ff32cd218fc5b365027d1019e042
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable, but the heuristics clearly show the document's function as a malicious link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • 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://marleenjansen.nl/images/uploadfiles/zefale.pdf In PDF document text
    • http://fese.in/ienupdimages/images/files/23474107922.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wareduw.pdfIn PDF document text
    • http://viettelhaiphong.me/data/dulieu/files/wewalok.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/25071231188.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/muriwomazapomoxixunaxo.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/p4f5fhda62b36pb3r9ijukkflu/4837406172.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/36341757549.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/vosozofeza.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/46804038628.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/xavopulojewafugelikofogaf.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132ffcda3460---26051284852.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/kixexebojo.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/33860342735.pdfIn PDF document text
    • http://japhina.com/upload/file/salojizufuzinotimimur.pdfIn PDF document text
    • http://kgmda.com/upload/files/nuvopilusunimi.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af273620ab---gezuxepaduv.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/tejatugajiguwewibij.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130f1bc08d9c---51495021632.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/13382933669.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/muxawodeletu.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/69288954273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=live+wallpaper+iphone+11+pro+max+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_off0000e404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE404 19076 bytes
SHA-256: ad9dd53b5065661c761744b36b3e56580d389cfc4e4e3399689802defc415ba1
font_01_sfnt_off00011572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D89 10656 bytes
SHA-256: 6ad97525d634aee1078eb1e8ad5f8cd944597021e42e1a0f2f48b87c484b8dc1