Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a0a26e70e5ec8b…

MALICIOUS

PDF

91.5 KB Created: 2021-09-07 11:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 12c3097f6c815070debed014d083cc12 SHA-1: cd3315b559d50390cafe99a29bf966504bc2cfa7 SHA-256: 91a0a26e70e5ec8b23d62d3d6876fcb453da1a8dea86a2f84e93b2b2bca1eb9c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the presence of embedded URLs and the heuristic findings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2680

Heuristics 5

  • 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
  • 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=meaning+of+environmental+management+pdf PDF link annotation
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/t213ptcbe4rq9vvqti5tl3n3kc/mitogumujumidas.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/kijoxetafinidofilawodet.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e168306d---48398968843.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/80019744234.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/52381053210.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/77971921448.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088549edffdd---perugojimolisazufupa.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/firoxeronanupasozerux.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079305e79fec---15255132399.pdfIn PDF document text
    • http://apnorajasthan.net/userfiles/file/63977013069.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/3inj0hde2v8o0epcqcqtoutqk3/nebelorafugowijamojilu.pdfIn PDF document text
    • http://bangkoksolarpower.com/syner_upload/images/files/gitezuxokexoroxegu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/98426961960.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0442b0de56---goterorewat.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/5ff11c909e567910f16645295ebcf78b/jozere.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/pivobewabot.pdfIn PDF document text
    • http://joesservicecenternj.com/userfiles/files/sidinixobafevalugefu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g0j4tlvervrup5h77g906tkikk/84510503085.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/genejudegaxejeguwum.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/zorukonoredikuwumamitep.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160f308a9ac000---83913530304.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/597dce10ca9e2b82af5a17d8d59e05df/xiforudofesiwamazib.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160723b8853038---92599446707.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075c432daed4---94270457913.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15359 10732 bytes
SHA-256: 88b448d1e5633edc65df33822394799f5c7b3eab8eb2c5674290308f8f8ebd8d