Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8974ff29606fac4…

MALICIOUS

PDF

76.6 KB Created: 2021-09-23 11:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dfe0973f721a00ffd7897ed28c4315f8 SHA-1: caa20a47a7fa5ccb3d1bdcff682372da558f9956 SHA-256: e8974ff29606fac4f57c47b1de3e3aa1c1881a97d697d478d94459208155892d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of links pointing to potentially compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=link%27s+awakening+gbc+rom PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144b16ad86f2---xejorakavixovojowal.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/37577111387.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/xojofipesorunupaj.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/116d986b335162d1fad15faf5e39ece8/63527556280.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/vakexadisenikosanabaluwu.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/161428b2d43536---81416179464.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/69595818856.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/nowiwejetiwijoxe.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zagawonuradigenojubikukev.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/vemawefaxuderedezazun.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/99nnis59qs52kfdgbk9ko29pu3/pakegizuzuwenidufega.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/69085647677.pdfIn PDF document text
    • http://01host.ru/userfiles/files/xakiwipabelawabazedejo.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109172248563437.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/ponap.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/22663685505.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/feguwanizalu.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/tirinalesebaruxofufukav.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/6923223682.pdfIn PDF document text
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/32135978850.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c80b86ec55---bibunagu.pdfIn PDF document text
    • http://www.77ice.com/upload/files/21408740402.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/wubobowumofifenexixu.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_off0000c2ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AD 10736 bytes
SHA-256: 39635e376563d4fe0d33fca39986eb488ec7b0fd231712ae70d75b00bddac0c6
font_01_sfnt_off0000db6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6C 18596 bytes
SHA-256: 1200ace194cf6a0211ae2650b16682c5159a1473ab5fcea5e21369f1e3b69a95
font_02_sfnt_off00010b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1