Malicious PDF — malware analysis report

Static analysis result for SHA-256 809c87a0841a0d6c…

MALICIOUS

PDF

72.1 KB Created: 2021-09-02 12:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3f584b04fe88bf4fca781dcbc14852b SHA-1: 8d654fe4d1ecda1aa244ce37d6448d662a7d61a8 SHA-256: 809c87a0841a0d6cc424d2a355762cca3c58fc60b5aee94a08f77aa4e3f7fe13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded links indicate an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=onan+generator+parts+manual+ky PDF link annotation
    • https://tour-paris-guide.com/cite_imgs/file/xuvekinejaluxomol.pdfIn PDF document text
    • https://ms02bet.com/contents/files/dabisixonu.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210810_616823949187BCC0.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/janufekanikopisupidunifaw.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e7cbaae0ce7---wuxunukogukifuluxusoxotuk.pdfIn PDF document text
    • http://efrex.cz/files/file/ketijajasemuwokezemuxepa.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/31938910482.pdfIn PDF document text
    • http://bestpokeya.com/uploads/files/15520401396.pdfIn PDF document text
    • http://360global.ca/userfiles/file/24248749998.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vugvekegajipnuh1itnej9dgr3/71831411045.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/60397337250.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/ragumuximobirevew.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/77198490063.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/84509583146.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/61212217123.pdfIn PDF document text
    • https://iuoshili.com/upload/users/files/12692175305.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/6c5ea01bdebe360d6e4d40bd49d475c1/16154634116.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/34576403441.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/74fbe5f200281de311196b25b1f4b3ff/69608404061.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/67931951099.pdfIn PDF document text
    • http://r2doodles.com/clients/4/4a/4a4ed909dcef54c1e3ec6a0ce1d29f2d/File/nanizapenaxu.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c15894bda88---dobazezedidawatupar.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/88619648973.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_off0000ba5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5F 15496 bytes
SHA-256: 7dd16d00151857bb5b121dd6f96e018aeaf12dc6584b29f02787a9ab8d6eb254
font_01_sfnt_off0000e213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE213 10832 bytes
SHA-256: d9cfca1a12711542edd3ecd1ad938cd745111bd5b7d8d82a1a9d5ea3f546e36e
font_02_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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