Malicious PDF — malware analysis report

Static analysis result for SHA-256 4687c3e9059d504a…

MALICIOUS

PDF

70.6 KB Created: 2021-07-19 03:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8bd9d45643ee0a561cd3c7feec06dc7a SHA-1: dfdb23748ccfeb2498b2460365ab20a4759fc39e SHA-256: 4687c3e9059d504a0c6fb84644d86830773af5c48f2686c6624479e1b86e0b57
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 WordPress sites and disposable domains, indicating a link farm or phishing attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly support this assessment. ClamAV also detected it as 'Pdf.Phishing.Trojan'. The ML classifier provided a high confidence score.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/h3vk2tsr5gpiv1bhv6uijb6b3i/tuwelimebazabobedujag.pdf In PDF document text
    • https://editionsitaliques.com/userfiles/file/70190636544.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8dd1384295---nameduvurifodo.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/tuvulimesisos.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/62884698624.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ot52v904qs4eu7mqh0k9hdrq9h/gowikigimenef.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/gusajafixumatuzimujute.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/c99321f1b6c3d758a2e46de3ea142091/safegesaxekaxometedikolaf.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/764302961.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/sonuxiw.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/68393950012.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/mazedofokexaxepazoj.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/womisolusurisivurofeves.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/9d58dd4bd13f0e1def021300b4c4b3c7/kideladazof.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/t61dffbbdmen6d3f43kp82o207/90358340379.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/xesafoladego.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/0ee52d5b3fda0acb9d6b30d001112ec7/sinuz.pdfIn PDF document text
    • http://kinogigant.com/sadm_files/vewoxomokeviduvetikipa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083b6b110870---73793020138.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7118f1506d---topogif.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084279a35f42---fuworu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/cc0a0c848ed62370d235da1c36f2bbe6/32722041155.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/8a62b7ae0421378e9b9a946b7598f3c8/rezivikufa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=how+to+find+the+value+of+the+discriminant+in+a+quadratic+equationPDF 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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7F 11128 bytes
SHA-256: 5731cfc0d1557fe44a774b89632a4fd91bb4bc635d1184cca1aa5a4759848f10
font_02_sfnt_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 14996 bytes
SHA-256: f40a6c47fb1ef1e9859b7a645d510239fbca61b02c12104c39b15c2c5bfdc7fb

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