Malicious PDF — malware analysis report

Static analysis result for SHA-256 89e20df6ccceedfd…

MALICIOUS

PDF

81.5 KB Created: 2021-09-15 12:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1beaf9317461b6d9da103e38187a3dfa SHA-1: cfd96355aeb76e7f124d9bb4fd516552c3b99ded SHA-256: 89e20df6ccceedfd22741b2d67a78ca9feb69a0ffd3b38d4400e32a5c4d76318
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smshealthcareservices.com/ckfinder/userfiles/files/rirefunozujokukojugomaluw.pdf In PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/zerokogu.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/11378157731.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/88947174155.pdfIn PDF document text
    • https://firsatoyun.com/calisma2/files/uploads/lafolozenu.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/72808701929.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/tosipajiniku.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/jolojolosugopub.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/xeponusaved.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/zamiduxawebiwubusamejo.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/70379044860.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/supasobitigozususira.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/11702551654.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/45136780786.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f496878a34---dowulaganugif.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/28793281278.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/du2fd80601dtiq92culb3ji587/53563700944.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/tilekikovabedu.pdfIn PDF document text
    • http://autolubitel-irk.ru/userfiles/file/vurajevowaverowunafalob.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebe13617a1---puveburezoweduwepibapuk.pdfIn PDF document text
    • https://krusomying.com/data/file/87956849470.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/xomin.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/46930479092.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/bifitabovokape.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/kobatupakikeza.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/b02922209390cf7b0602dd9e5338a341/27387871463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=android+l+iconsPDF 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_off0000d7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EB 18560 bytes
SHA-256: d2d463e7255ad47dfc3d49e817de7a1e5082ba8bcf6727fd4dbccb41d17d457f
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 9952 bytes
SHA-256: 2face26d5ebfc15b321dea26d6afb9de38c9ed656b1882db2c6e7e7848d01c40
font_02_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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