Malicious PDF — malware analysis report

Static analysis result for SHA-256 67cd814926fb933b…

MALICIOUS

PDF

71.8 KB Created: 2021-09-08 08:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 46e3d275518f7137bcae84635dfd21c6 SHA-1: fb61ca4261939d4326c303805b8ba41869e5b6ef SHA-256: 67cd814926fb933b5997da6ea4dff62ba36ae5f71a0fed4b48a3087b9ce7faa8
96 Risk Score

Malware Insights

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

The ML classifier strongly indicates maliciousness, and the PDF contains a large number of external links, many pointing to compromised WordPress sites or disposable domains. This suggests the document is designed to redirect users to potentially malicious content or to manipulate search engine rankings. No scripts were extracted, but the link farm behavior is a common tactic for distributing malware or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inwebjor.ru/uplcv?utm_term=historia+del+arte+griego+y+romano+pdf PDF link annotation
    • http://secohthailand.com/file_media/file_image/file/43258394121.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d2c84eca---vukidimasefedol.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/pezadawovekijaforose.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/19926840517.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/64197565091.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6529e6eb---82344178052.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/60079773312.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16094180447eaa---21042127665.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607335fc01100---41252115335.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/2898225218.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8bec96d64---48849913334.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/1285562267.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/93009139678.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/019dbaec8252c453a96312cbf881cc87/wujowipukonaxevozasud.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/452679b27adc5e2d75f2b64cae351fee/92865235415.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081e3b480966---govigebe.pdfIn PDF document text
    • http://bafiti.com/sklep/userfiles/file/nowibad.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/guzevajeba.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/wexoten.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb3ee4b582---40391778753.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/25183257424.pdfIn PDF document text
    • http://ty-int.com/files/files/nenopojag.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cba7c9c38a5d7966af8e26d608a62080/69803812468.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_off0000b723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB723 16684 bytes
SHA-256: e14f941396326cb6165580ac5618a0b05ed328b13cdd72cc31db13944bc2111e
font_01_sfnt_off0000e06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE06D 10948 bytes
SHA-256: 38070730645e801c0c125d88b5bdacd459a90ea62317435a64a6bf001b707797
font_02_sfnt_off0000f98d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF98D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1