Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a35b6e32124906…

MALICIOUS

PDF

91.4 KB Created: 2021-09-14 12:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a91a54f1f1b12d5b9a9d4c04bdece5f SHA-1: dc73079611ed70694ad55404c0d5e713d072a99c SHA-256: 90a35b6e32124906a5dba4fd14b0732ea46a26aa78aafcb5c9f3771b257a6f94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL findings are sufficient to infer a malicious link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/59496533369.pdf In PDF document text
    • http://agro-partner.com/Image/files/rugizebenoveju.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/defixiwufetalorulujak.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/vebemolegok.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/42675773863.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/forewajefavuwodukobabu.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/19010792936.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/c59gl3lf2bcfh2b2m1aqcaukd1/malupamixula.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339b7c1d906---44713384823.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/seziwugojawolo.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/fed26c0e3edcc552e662a1719f47fefb/66296073762.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/65509132667.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/75095596703.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9fb0aa843c9a532503e969c2c5b09ad0/37527015392.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cde235f29935d72674f46226ad6bab21/75269874614.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/xovosofigubozilo.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/42827618340.pdfIn PDF document text
    • http://lulanjina.net/upload/files/36395950083.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/41338191455.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/64234286700.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/2012ee53644f068ba2061004d91cd5f6/vumudur.pdfIn PDF document text
    • http://snft.ro/media/file/jidadako.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/woseromubade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=gta+san+andreas+stunt+plane+cheatPDF 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_off0000ff32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11744 18740 bytes
SHA-256: 9d9ebdefe50ba023f88c90c47983e8cc6e19cb6558704a7acdea0ed92e517bfe
font_02_sfnt_off00014814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 10536 bytes
SHA-256: 4b8ceb8051e8721ca13f468a841fd2c238547ea300ba07ae1f5087de48d18fdb

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