Malicious PDF — malware analysis report

Static analysis result for SHA-256 35859f90d24f419a…

MALICIOUS

PDF

81.1 KB Created: 2021-09-19 08:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4253c1b10dbb3ecea95f3912433310f3 SHA-1: 66cb75f2182eb08431c77912a3787f2b363d3a07 SHA-256: 35859f90d24f419a42cef776a250636d2a41c427fc2f3d97005a6a94c04de5d2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure are consistent with attempts to lure users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 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.
  • 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://tyeetomsfishing.com/userfiles/file/kawivibarinovum.pdf In PDF document text
    • http://hoclaixebinhthuan.com/upload/contentFile/file/lubizap.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/46720266942.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/vifojab.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/7015996171.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/lekegim.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/pinuronupux.pdfIn PDF document text
    • http://lg-palette.com/upload/files/35800840266.pdfIn PDF document text
    • http://186086.com/upload/files/wixexanapitijufaxu.pdfIn PDF document text
    • https://ntct.dz/ckfinder/userfiles/files/61852981707.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bcc1ed21778fe9f673851f136eefe3c3/zomimev.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/74006147825.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/rosisa.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/19770457045.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/5225014094.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/netirekuxedux.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/najudexusuvogimisesabezef.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/7842990146.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc3cc2859a---mezowaxapapumisamuxirad.pdfIn PDF document text
    • https://shaplaconsulting.com/app/webroot/ckfinder/userfiles/files/9603800435.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/1038626701.pdfIn PDF document text
    • http://camonetinternational.com/files/file/teguduxiji.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/lp5tvlrgu6e0blad901r40kkuc/neruvojunereporu.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141291ca4d17---32799360988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+emerald+rom+download+for+vbaPDF 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_off0000d5d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 18088 bytes
SHA-256: 64e9a91a32511feb55b6c66c0ad28720dd9d1cb620837ef8738f21003b9162ec
font_02_sfnt_off00011d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4D 10544 bytes
SHA-256: 4c4b9136049e3590aa4bfb58061b5c3ce71f7c41b50ac05014222a690c8c2946