Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeed9ebad2168e8d…

MALICIOUS

PDF

82.0 KB Created: 2021-08-10 21:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8f904339393fe181f187a671f1c38f9b SHA-1: 1bfb1aaf5b1634b19965c3479416e9d3df1e1af3 SHA-256: aeed9ebad2168e8d1383fe5252a8c8153c3d6f0578d47ecaaf4573695c1c61a6
104 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external links, many hosted on compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicates maliciousness, and the presence of JavaScript points towards an attempt to download and execute further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fdfea478c---rofevomafukarug.pdf In PDF document text
    • https://iwistw.com/upload/files/vesorebesijeni.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/26018389673.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a753e51b00873bf103b0c0b5b2592cb9/jupege.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608593f68bd5b---39458997178.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/173779269feaa9c0d322b303a13923d8/kiwebosug.pdfIn PDF document text
    • http://kristenpell.com/userfiles/files/kosomabifebosuloletel.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dlsjf0f13s5u0u3g56fltkc9j3/16678052479.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7eedc75f0---raramojajejusevozifezumo.pdfIn PDF document text
    • http://azizolace.cz/images/file/76281371048.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/larofibawekebeluvafanus.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be2109ae9---falirofipivusojafures.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610cec6cc83a8---tejoxepewujubofij.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/713da6177b58a80f6e51c22ab0764330/fomafujufedow.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160871af16307e---12985079995.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079804025dd5---xivim.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/66535182118.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/zarisurilujoberakekijuje.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/sewizomigozenaloni.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/58af4424afd13892e930cb81a3485c7b/21252059039.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/sezefos.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/tirolilonisogofubumesero.pdfIn PDF document text
    • http://www.siposferenc.hu/html/venoxekegojijusesamili.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=%C3%A1ngeles+mastretta+libros+pdf+gratisPDF 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10984 bytes
SHA-256: 3e13b26be04ad7309c53bfaa50158af808d3896ddff8433c85a0ee5f65b997cc
font_01_sfnt_off0000f3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F3 17220 bytes
SHA-256: 8266b6dcecddedbefed32b2d2345005b2f93741ed44455e342e5457b85bb17bb
font_02_sfnt_off00011fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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