Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b21d384325ed66…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 13:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b3f5f03c77673630a0083dbc30cd0b3 SHA-1: 30b1b7a7af86212b28746d072cf83bdb00c37694 SHA-256: 31b21d384325ed66b6dc6db05e5cd08c56b30e6a882b88411df8d3b6b5b97d03
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is a link farm designed to redirect users to potentially malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://philabc.ru/uplcv?utm_term=freeze+android+apps
    • http://businessnavigator.in/ckeditor/uploads/files/tukabuna.pdf
    • http://kmsenior.org/file/files/satetefopakobeko.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb55a319ba---82531035756.pdf
    • https://oolong-dining-co.com/webroot/editor-uploads/files/tufunexirabagogoveza.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/mabegibepevujuxudajis.pdf
    • https://mudraconsultancy.com/uploads/files/61874089.pdf
    • https://tbsva.org/Upload/files/20210913223427.pdf
    • https://sandp-engineering.com/ckfinder/userfiles/files/10290636355.pdf
    • https://estoniapools.com/contents/files/11784935820.pdf
    • http://enjoy.sk/editor_uploads/system/files/4791875916.pdf
    • https://relans-nn.ru/images/docs/file/6038055461.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16135603d2c517---15102695187.pdf
    • http://ecohort.com/userfiles/files/xegiwopegufuvutoxodefi.pdf
    • http://fohow77.ru/upload/file/81501789249.pdf
    • http://hoangnamjsc.com/upload/files/83105364380.pdf
    • https://lean-ds.com/upload/editor/file/davivepogoxofujolisewak.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c1f48399a---vetirexoz.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/161351af88f4ef---rojavivazewusalajupinivez.pdf
    • https://umutfm.com/resimler/files/xefoxexikofojomuraweso.pdf
    • http://sklepjola.pl/userfiles/file/82666101913.pdf
    • http://ytbozhuo.com/upload/file/051513498411.pdf
    • http://htcable.cn/d/files/manezalexaxijet.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/e2dfef77a146c1205d8fc95ed5fbb45d/xegubep.pdf
    • https://limsurdua.com/contents/files/paxobikedut.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC0 16792 bytes
font_01_sfnt_off0000f2d7.bin
7731fb8022081e1f2374f9ca5813aaf466e2940aa3d3b3cc14ec152a8d5c410d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D7 10276 bytes
font_02_sfnt_off00010a01.bin
b6fa2e0fce8cafcec51541b0a61345941551740d162576b155ca8983a61e2b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 18448 bytes

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