Malicious PDF — malware analysis report

Static analysis result for SHA-256 452aa428aaef13f9…

MALICIOUS

PDF

92.7 KB Created: 2021-08-03 04:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 44a0ac562208b114913ceac9ba452e71 SHA-1: f47969e32d7a29b643920f3df4f29a34e7b60ce2 SHA-256: 452aa428aaef13f9e14e63c7e9af7beaa490b12f744648d2461b1f474d388594
196 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs a social engineering tactic by luring the user to install a browser extension or update, a common method for credential theft or malware delivery. The document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm used to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://laborke.ru/uplcv?utm_term=run+android+apps+on+iphone+jailbreak PDF link annotation
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/6c76c6d1fed9ad717bdb4c068c52ff96/lafodogazodus.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5bbac7439fea8a50360d8009da3424c4/lekifisipapejuvijiveziz.pdfIn PDF document text
    • http://cwesp.biz/upload/file/11354114373.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad751dd45a---19290745475.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a41e105ff---24594898832.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7467b17789637a8f34e14444b73762c0/selufavajevepejopereto.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c303bd14498---18615949671.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/xosiwafugowod.pdfIn PDF document text
    • https://mmszke.hu/files/file/vawuxegaloxopoma.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/miva1hba7nhe5uc61m7sdico8a/9015918590.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210803084909.pdfIn PDF document text
    • http://dd-eng.com/files/files/38521202562.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/88500705714.pdfIn PDF document text
    • http://resurrection-life.net/userfiles/files/37355653562.pdfIn PDF document text
    • http://duda-tech.pl/dudatech/upload/file/titajunesagizivuvirufuta.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ter5tqakd3p3sgdgh01bj4kjq2/reduzizozuzafotaze.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ad39d46dc---7815627616.pdfIn PDF document text
    • http://nineslash.com/user_file/file/gikelogul.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0706/cd11fe6f345bf95ea715ca81f5cd4b55.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/5a2e1b5fdb956057a9d98a60c4c5b1e1/98240278247.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/37305651938.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/monebexalenefivosuwoboza.pdfIn PDF document text
    • 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_off00010529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10529 17700 bytes
SHA-256: e6f11dc2e1df78a54b6db5d3eba379466f307a45b0f1dc22b0dbea5def8c7e68
font_01_sfnt_off000133c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C0 10900 bytes
SHA-256: 16cca26233f78d42d8fa4d1c6f516fab152ea1c6d0649d6c5cdad6d6256669fc
font_02_sfnt_off00014c94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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