Malicious PDF — malware analysis report

Static analysis result for SHA-256 f288afc44bb3782f…

MALICIOUS

PDF

83.8 KB Created: 2021-08-28 11:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01774f4ed8b391229fe7accd35c4f608 SHA-1: b4dc100e739cd40a6ada996e52830c484fb84826 SHA-256: f288afc44bb3782f9f9596883842503202ff048f057d80684f0d64486b15b9fa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crewmak.ru/uplcv?utm_term=difference+between+a+longboard+and+skateboard PDF link annotation
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/bdn2f66moln51nd2j36om4o3re/89699220087.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/zitakipinum.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/73841345753.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/90994328576.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed683d964---tefofifuzuwabejamu.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/galigo.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160fdbcbd12d55---xewabaterivitezaximawi.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/bukubaxulufotim.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/2c6qph7qlntonm7umd73g4ihu6/79229046232.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/supagewo.pdfIn PDF document text
    • https://led7.ru/file/jineju.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/rivowepobuwuretamiwasom.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/kemijexawomorebujed.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/vhmu4knredgiejfhg5h569fa8i/rufubedenali.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202107190143029968.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/zewibamugolixujadi.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/gazisabobezibige.pdfIn PDF document text
    • http://huimao.com/upload/mopedipetepopujifikelipa.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/57555597046.pdfIn PDF document text
    • http://beytarimcilik.com/admin/editor_resim/file/xudetojanip.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/82690538211.pdfIn PDF document text
    • http://vtaky.sk/media/file/dotopekodul.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/lulevomujevoladasojorudu.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55037992594.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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF952 10968 bytes
SHA-256: df3c1e7afe4fb3bfdf9e8873974a2e047b83e5a7e372c9875376e079d27dfe21
font_02_sfnt_off000112ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112CA 17496 bytes
SHA-256: 7f235573227f903688a9e2853d51e1b1055a09e6a05c596635f48bdb9c49b417

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