Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6aec9008ae2ecab…

MALICIOUS

PDF

72.5 KB Created: 2021-09-11 13:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e4c447fa62fe6f01a08a2d7f79291d86 SHA-1: d53f96619d7db0c66d64873b36e7157174dc356d SHA-256: f6aec9008ae2ecab17d62819579fa37b0c15444856341bc50917ba9feddd880e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF link farm heuristics indicates a deliberate effort to obscure the final destination and potentially distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ef5j7l76di0rh6esl30vtgg5fb/17111757187.pdf In PDF document text
    • http://fredericjean.net/oplusco/file/68955030533.pdfIn PDF document text
    • https://red-adlay.com/upload/files/27632676960.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/xuwikasodisimakisenad.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/kanupivu.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b480bca7caa07e8186d8807e9c089287/nimuladelazolatamapajo.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/rividiruwepoxib.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/11071019500.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210909_034804.pdfIn PDF document text
    • https://seltec.io/images/uploads/files/21652842748.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bef614b06f400b305a66f0b50aaab3b9/zozameboriwixofewefaxot.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/ntn2g1s2d855p4ihbef8pu5f87/30782675684.pdfIn PDF document text
    • https://barcelona-health.com/files/galeria/files/zavoteboxe.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d095b61d6---46957644231.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/19989018837.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/22618612244.pdfIn PDF document text
    • http://www.mattig-accounting.bg/fisiere/file/rofudidud.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/92590867915.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/gepopukasulup.pdfIn PDF document text
    • http://starma.pl/files/file/95821855202.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/bemagipakeda.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/89097877335.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/41416986707.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/mikosijo.pdfIn PDF document text
    • http://livestocktool.com/d/files/fojikukuded.pdfIn PDF document text
    • https://aashianarealty.com/file/8741201994.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/67309481403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+you+find+clipboard+on+your+phonePDF 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_off0000bb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB77 15664 bytes
SHA-256: da5fdb13b1badb49371822ea090b312b01a7a0ff37388b74fe14cac2393bbaab
font_01_sfnt_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 10880 bytes
SHA-256: edd3be8f611b3a508e16b5ff6d68b6bfabb770de3204dda1d5be417f87c0ade0
font_02_sfnt_off0000fbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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