Malicious PDF — malware analysis report

Static analysis result for SHA-256 6627e909e7da6208…

MALICIOUS

PDF

91.3 KB Created: 2021-08-12 17:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c17b7641c2964efae8e987b421b43b4 SHA-1: 293b197e20417e97821b3b3ebf2ecbef6fab3188 SHA-256: 6627e909e7da620849032f78e95f433f6e947aed2d68569e1c9bc61028a74b57
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to various compromised websites, many of which appear to be WordPress installations with vulnerable plugins. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this is a link farm designed for SEO manipulation or to host further malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6jarbqch0qrjea46t2a93ps1r5/jajapopilu.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc092e7f24---539871124.pdfIn PDF document text
    • http://bong-dem-long.org/upload/editor/files/rizoxu.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078e871e8179---nukivotabugitarodoge.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161032254acd92---natumajaxigevuxemoborevif.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b4fc60b2762---10838936307.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160792a8e84987---64326088413.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160709eb214a77---vizogaxuwilutelozer.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/u3vhvikmpg9sqb00a2ddh01250/34550250983.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/9c397bf1a3d291a17c5f4182d79aa60e/82882690584.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/paxepakamovo.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16080fc232f1a8---55954411220.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/18802730296.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/namewuvawusevadarolut.pdfIn PDF document text
    • https://uudanbury.life/files/file/zatixofazugisuvuxuka.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/vomibovemiwolabamawula.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ac3d1e466---19951794418.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/tabexedoze.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e07a8e125---5651493216.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607608fe50ea2---wawelifomurobunaxapo.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/82632893191.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/43722629351.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0c0c8b195---36880664063.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927e78a9741---vabuvawisibirokozagedibuv.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/tizatalajatopav.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/89953441896.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b5c27e3e2---xulubifavanexat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=pass%C3%A9+compos%C3%A9+vs+imparfait+exercises+pdf+with+answersPDF link annotation
    • 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_off0000fcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC7 17644 bytes
SHA-256: dacd3489629134cd9373edab04e1d7d9d06b48cb90b7b428b87b65affba92de5
font_01_sfnt_off00012917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12917 11248 bytes
SHA-256: 0fde6e16a660bb9d53ff086750e621f8afbb9cf64e4afdc8f74bd6ccb14b998e
font_02_sfnt_off0001431b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1431B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1