Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e5363fa594f344…

MALICIOUS

PDF

84.3 KB Created: 2021-09-11 19:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7369d5bf22272208812687ec64dc3412 SHA-1: 97a479cfd2956cffe5318910351ca566320f10d5 SHA-256: e9e5363fa594f34453202c6901735664ba74d28f8a10ba252f690f9c55a2c1d5
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document contains a link farm with numerous URLs, several of which point to compromised WordPress upload storage, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the presence of external URIs and compromised hosting points to a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://signos.larrialdiak.es/files/galeria/files/29049431060.pdf In PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/24051054063.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210911220632.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/95398013593.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/40623043085.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/15203340830.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/vevanisimefofasokotovi.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/17204006293.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/zonumos.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/3279317726.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/3378da9458428ec4092507c7c7714973/momotuf.pdfIn PDF document text
    • http://www.ezmoving.com/file/nepifomiverutumezujemebud.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/rojisuba.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/7b117b273bc9984cf54cb82720b38f3c/tilemorozeban.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613498b35e4d9---tuduw.pdfIn PDF document text
    • http://synhbio.com/upload/files/58274533211.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/39101020061.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041346596091.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/luwotusesejub.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/36456241263.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613694a709b0a---donolorubamububulonezo.pdfIn PDF document text
    • http://egitara.com/upfiles/files/50624327839.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/40763762825.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16134698cc6ad6---zexirifemopaxizakulipaji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=pdf+to+ebook+format+converterPDF 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 10632 bytes
SHA-256: dab3707de61fe327449756d7640449149bd13bf41e752951a0c997af082b1e1a
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 16948 bytes
SHA-256: c2a9d2796d348312624429144458f4c617cc70b5ff3e4b25d556ed1cc7d5da58
font_02_sfnt_off00012b3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1