Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e32a963ab0ca6a0…

MALICIOUS

PDF

88.1 KB Created: 2021-09-01 13:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e3d5af9b3c26c0f6dc7819189998b229 SHA-1: 36f5ba684e2651608aef2be66457732074fda4ff SHA-256: 7e32a963ab0ca6a0fccfe6c99913a495ff39b95fda0899c5770801c85b9c7cff
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://fine-cottage.ru/userfiles/files/fesolatefowerig.pdf In PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/1556506a60aa43d35f5786329aeaeba6/dulos.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/japikotugebumiloweb.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16091f802778b7---widizadafapaxebuwefezab.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/c4235ea34341b5dae5918f5890c9f68a/gatunigopifa.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/vomefebabexefixidasonusiz.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/16665958990.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/tefede.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2db883a47---givapozonefufi.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610fdbcc3a83b---85871943966.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607847cc73ba8---93524459096.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/l9tipm075lhg8nu22bjukd7r6u/lomozexovodulamatozi.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/d6f7fa3b0440c20990ac19780e6ad397/24905674374.pdfIn PDF document text
    • http://sneedfamilyct.com/clients/44919/File/kimexavukatij.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/9d8ac4ab2393d294e7a64d37aaadc352/gokanodigubikexo.pdfIn PDF document text
    • http://kondicionery-himki.ru/upload_picture/file/55541690835.pdfIn PDF document text
    • http://mayjack.com/upload/files/dabopukorepeka.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/24185790539.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7475cc20667ac8e7a2807c6e35dda5ed/21704455396.pdfIn PDF document text
    • http://grupafurman.pl/!mag2011/userfiles/file/98333160481.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/50694671341.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210808035209.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/seguremakuguxixeku.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/rc7aeg9ffbslqut34eqkc9j9ad/fafexubakasovidi.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/40303449960.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=introduction+to+operations+research+solution+manualPDF 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_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 17908 bytes
SHA-256: 639a875e11f987027dc085e5b64072045ab247dfd67a205a38f53f51c568eddb
font_02_sfnt_off000136a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A4 10832 bytes
SHA-256: 5908a0dd64a243098c9fdeaa9c9c437a088faefde8f3ca6c51ef13d1cdb4c001