Malicious PDF — malware analysis report

Static analysis result for SHA-256 b603f21d26d30851…

MALICIOUS

PDF

76.5 KB Created: 2021-08-20 15:43:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 07e6dcbde0f2775427b2c0e5885d1372 SHA-1: 978d4651ddb26b630f3e09774f1e216ffd2b07ac SHA-256: b603f21d26d308511a71165211b96b418d3b6cfc46dc290f339d2cf4e6d90751
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to PDF files hosted on compromised CMS upload directories or disposable domains. This suggests a link farm or redirection scheme, likely intended to manipulate search engine rankings or distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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 http://daugiavanthienphuoc.com/media/ftp/file/wanugefivomivav.pdf In PDF document text
    • https://groupunsur4.com/contents//files/79643845293.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/zadefuwifilamujegis.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1282f14fa9---zorudafeketabedododobej.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/43942383194.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/4c06b49d0a485726cfee8e9a4f7b4997/24758790109.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb76e97ff0---rufubolofipilobakukez.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/do9shsb1v5unck7jini313smn2/mulur.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/74655798684.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0d6d9c5b---17122433344.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/10084633709.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c624a214---xirabitadepirulate.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/0da6d818614c1b482fb5b722b60cac9a/vunububufebubukesatifepif.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/gofano.pdfIn PDF document text
    • https://sarahgpl.com/userfiles/file/vuxorez.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/ruvenukiwenekexoniwujadel.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/pumasujugijumokupikedazo.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/49432454595.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/fatatuferupe.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/137ec4989fbc68b4bee2013056e44058/17235300740.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/35177285487.pdfIn PDF document text
    • http://nothingelsematters.net/pharma/images/files/sesivilomuriwudip.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/8050df4f006da8c6074e912aa6531852/zegokanug.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/fininazemitegutiwuvumipu.pdfIn PDF document text
    • https://progin.swiss/ckfinder/userfiles/files/tijegesaxawefen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=realidades+2+guided+practice+workbook+answers+pdfPDF 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_off0000c408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC408 17384 bytes
SHA-256: 45257e3b27d207cfcb529babeb635fc4b1ee9e27304802912514a12e22331341
font_01_sfnt_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 11380 bytes
SHA-256: 37ee0a3f6d51bf191e818808f6c63b9b7d3bc5350708a70a8abc418c33b7b96d
font_02_sfnt_off00010c06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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