Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a7528814d78b39e…

MALICIOUS

PDF

73.1 KB Created: 2021-08-27 00:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 1ec1401d72289db9095122212652cc51 SHA-1: df9550fa7e2649587bdaaef5aef29c5bc9a72a8d SHA-256: 6a7528814d78b39e47fe5aab62fea2f5c4661c0423ef79123fef9f5bc63d884a
64 Risk Score

Malware Insights

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

The PDF document contains a link farm, with numerous URLs pointing to websites hosted on compromised CMS platforms, specifically WordPress. This suggests an attempt to manipulate search engine rankings or distribute malicious content through these compromised sites. The presence of multiple distinct hosts and the use of UTM parameters indicate a coordinated effort for SEO spam or redirection. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

Heuristics 4

  • 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
  • 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://happycolaborativo.com/uploads/files/96908488725.pdf In PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/crvv0fdobkh4q3c0dkupga6et5/89564935940.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1460dade---vupinezukevaxuz.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/94549175444.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844814d8eae---pafetopajowugumotazidiwi.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210805130939.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec5fc0a8a3---34562197813.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9853c271c---49824968332.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eb12cb4d7---murijolexadowonagoginemim.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fd4054c4c---76980324951.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3348d656c7---dofamasivapabekelof.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/8de97938f8062c6c98ccecf419757b8a/6660151133.pdfIn PDF document text
    • http://music-saikung.com/ckfinder/userfiles/files/42860861411.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/5456505222.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607eeb33dd8c3---67066278394.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b42390a0eb2---sawomajidabupelavu.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/41176149721.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/694512796bbbd42b6ce29907b273c749/26518380103.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/8372546733.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/vomirux.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/lobubifosebubopagopexaxaw.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd026cccbc---22015661506.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/72039265286.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/46d482857f47349c62560ef36835a80c/67034620780.pdfIn PDF document text
    • https://invest.pl/userfiles/file/53499153217.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=hollywood+movies+in+tamil+download+tamilrockersPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9D 10880 bytes
SHA-256: bb7f96cd2c28e50976b8514c4bacbe9a1bf744fe494aeca18bd28f1c2e74a19e