Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef3c84c61b034f9…

MALICIOUS

PDF

89.5 KB Created: 2021-09-04 00:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09b16ab888255a9fb9d7ca855def4ad3 SHA-1: e56259f492cd1d1d3a843985058b07515e692551 SHA-256: 8ef3c84c61b034f93db15c240a7fc7606dd642ad07ab7bbccf002876648e41d3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of external URIs strongly indicate its purpose is to facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=guilford+creativity+test+pdf PDF link annotation
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160893e325c433---niwuxop.pdfIn PDF document text
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/japajavukevop.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160820136bdbd7---kirimubedan.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/89287882579.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210812165706230.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/89562046891.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ac1b0d8ef---6190098118.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4o4pcul1k5hetrorjte80pjpvg/fozofuwifaderemewuvevo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abce2a7f6e6---bafusojawajefatigobini.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f81f11b8c---87974347694.pdfIn PDF document text
    • http://vietxetai.com/wp-content/plugins/super-forms/uploads/php/files/7hm9bacetqgqo3fmu33fcvvj6e/lisuxuladagurodafunaxili.pdfIn PDF document text
    • http://webbuilders.com/files/file/dasodedaxaw.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/9knlskuldinnhaogbe0at1knm6/10339557161.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/14838793383.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/eb596797b7069d50101bbc892f18aca3/durilatoguxakubosireraf.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/relurewafomefomojewoxawul.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/76168619119.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/pilimiregiwevuw.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16094c866a0d91---tixovur.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/nhcpbplvdiukd1ukjjhtgqndh2/zerigo.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/66185477490.pdfIn PDF document text
    • https://zhansq.cn/upload/file/31781596915.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c174c60cd---nusenef.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/furenuzega.pdfIn PDF document text
    • 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_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 19104 bytes
SHA-256: 1706272dbdb5877d11b5784bcc68d95d593de59f801b4a0dc95290a8744f7c29
font_01_sfnt_off0001270d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F24 10828 bytes
SHA-256: 83f92def1f82071029f053f6a80ed8d8d51ad7fed62257f2eb0ac07968518d62

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