Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcca113b680ceb72…

MALICIOUS

PDF

80.7 KB Created: 2021-09-22 20:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 3586719c1fac8d1a793a37073d8d8f67 SHA-1: 1d868df864ddd43143f918e156b404fbed7f38ad SHA-256: fcca113b680ceb724f32ccdf05a102d03f323a5ae5a56eec0b061f2e30ce8c44
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to PDF files hosted on compromised WordPress sites. This suggests the document is designed to lure users to malicious content, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=game+mobile+mod+apk PDF link annotation
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e40d681e0---rodatu.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/nulewekerijapur.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/80102318634.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16144766c9407a---57127774189.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/2344624375.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/riruwagukipunu.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210913041051.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/97792742466.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161337fc331a31---patow.pdfIn PDF document text
    • http://andreevka.topmebli.com/content/xuploadimages/file/84528264600.pdfIn PDF document text
    • http://aquatherm-graz.at/files/tatifinekonulajibi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/55847862505.pdfIn PDF document text
    • https://watosaphotography.com/app/webroot/userfiles/files/20210903_022223.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139cdee133c6---mevuwofesosonufuwukepemo.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210912065923.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/xowoxopusowaravepajagi.pdfIn PDF document text
    • http://ymmicro.com/files/files/34686676837.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/kinozawulebumisozel.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/foganiku.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090915291573499.pdfIn PDF document text
    • https://highrise.pl/file/91333976295.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/rapotogefigudin.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/pukukobudigof.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 17688 bytes
SHA-256: 0d95c3157f369f5745a7499f9c183394d790edada2fb12855a8f1d995dc0cab4
font_01_sfnt_off000105ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 10352 bytes
SHA-256: e8930caef885067066ef44a8c5515f406075557ad94a93f38a5b1e227461c2e3