Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7fadc2980cc3d36…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 10:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8418cf57d41338abce768e57b3f59ef4 SHA-1: 8b603b82d005a9b3f4c4b131438faceb0105b9fc SHA-256: c7fadc2980cc3d36e56b6381ec947c467f536870d3f8cd33a0251fc240f19ebd
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. The ML classifier strongly flagged this PDF as malicious. The presence of numerous URLs suggests an attempt to redirect users to potentially harmful content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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://archism.ru/uplcv?utm_term=traffic+rider+android+1 PDF link annotation
    • http://salamino.pl/userfiles/file/29602332663.pdfIn PDF document text
    • http://xageunion.com/userfiles/file/riwidalubekonebegowaxefep.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/17266202971.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/sazemamujijumusepovuz.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210916020017.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/79524362733.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15d84bd60---paxejulav.pdfIn PDF document text
    • http://artanuji.ge/admin/ckeditor/ckfinder/userfiles/files/korovotexigupe.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/xofix.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/89012400402.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc158961ae---supazewilepesuw.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/mudezosapejuxifelesir.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/20219231611452838.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/m2iq5jo0s00lqansrt8v0ujcuo/45582278445.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/tigoruter.pdfIn PDF document text
    • http://soojuspilt.ee/files/file/xetetusuzek.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/7b27ea7ca4c946135a9a56c3a5c2132a/22861693287.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/87321839937.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/wodenipupobutoxagenufib.pdfIn PDF document text
    • http://ipublicity.cz/data/file/wesijegovikodasatifitekaj.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161354292b95fc---meloburodolukobonosaj.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6bd6c7b4780b8db05e20553433db61e0/takakadobavopojoruji.pdfIn PDF document text
    • http://associatedreclaimed.reclaimedoils.com/userfiles/files/19680165941.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/defuzamenufoza.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/7961550284.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/86947346089.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_off0000b597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 10172 bytes
SHA-256: 1d727da32e35949242a5f7b16e5934bf70ab3d2a5a5f57a07a01b7370ad0d68d
font_01_sfnt_off0000cc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 15736 bytes
SHA-256: ba5781e291a90ba833a972ac1358eef0497cb13a40c46c9635ed068c68251294