Malicious PDF — malware analysis report

Static analysis result for SHA-256 0beab070966ff51c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 07:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bc610e78397117a0c330b42bbf5fe69c SHA-1: 2b9d8c877055a15094031a7d2dabaaaa669da391 SHA-256: 0beab070966ff51cf2f4c2612b63893d03c59d81fbb4771494bba1ccf8238e0d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also features a link farm pointing to various domains, some of which are identified as compromised WordPress upload storage, suggesting an attempt to host and distribute malicious files or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://kanalizace-ul.cz/userfiles/file/99721888382.pdf In PDF document text
    • https://pre-www.bridge-college.com/uploaded/ckeditor/files/34973582024.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/jalenaxopapevuvu.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613132f339b50---girujuzufojek.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/74808047708.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mejovetimanezumutalezaw.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d90c22fb58f25ec5385ede59c18f679f/74157252324.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16132cd8c872d3---64506556385.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/jofitubefuxenijovosoxuzo.pdfIn PDF document text
    • https://jagamimpi.net/contents/files/28138767022.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/dabometatufufewadunen.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/f597a7377dd2eeda93d981274ef9c15a/xazetoduxetelavobo.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/ea9f0569a5fb4852e548e03482779ee8/86451125935.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613612d4e1328---bitasawufefofazuz.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/fd28a3fb38be404b2eeedc8774227333/53083135257.pdfIn PDF document text
    • https://slotpt2.com/contents/files/nazal.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2fc04e2ca---vedosesenazerulewe.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/66442524247.pdfIn PDF document text
    • http://belniig.by/public/file/redit.pdfIn PDF document text
    • http://www.focitabor.hu/userfiles/file/nuwavorasi.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/43418785636.pdfIn PDF document text
    • https://digireg.lu/upload/60321735315.pdfIn PDF document text
    • http://www.florentmaussion.net/userfiles/File/lifazako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=makeup+plus+app+apk+downloadPDF 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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 18652 bytes
SHA-256: a45dec982a2988c39305dadf6c88e352dae9c6ba7a97f09764b1e664bf254eb0
font_02_sfnt_off00012519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12519 10368 bytes
SHA-256: 15b55c9d391a1d62d0882a1210d27a701530f8b2693dee39e48dcc52068dd56e

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