Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f06eebb5b0d3e3…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 05:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 00468323e88b470edf17afe630ce9ff4 SHA-1: 7681016a233931e0ed4dc2c953ccaa307318034c SHA-256: 65f06eebb5b0d3e3c53122871c99b419800a56e670707721d79ec1606376ce53
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple external websites, many of which appear to be compromised WordPress installations. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to distribute or redirect to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://jonme.net/ckupload/files/betivinawigupifotamo.pdf In PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608e361164677---werasiraxekavusaf.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/f7c4a81ae3864702da076a4ea718b990/41090963419.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8d382e15---2754497418.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/kejakinanojifefofijuno.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/10441437569.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/47102921160.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/jokex.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/67bd22510d40ae17f60badb2343daa7d/xetaduwituxokunogugawa.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/a485310066633ebe2e89e9445512aad0/7774352796.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e365a1b2c1c---mozekasiwuxemozefetesu.pdfIn PDF document text
    • http://hodinovysoused.cz/upload/file/suvananavifanazofukixuj.pdfIn PDF document text
    • http://chinazzjx.com/d/files/rujagivi.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/15824279635.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/24304521076.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/gadukulusa.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bab109a1000---nafikugetuxadegiragojul.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/89952208847.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/volufafaberokamama.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/63700032979.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/sigawujumakejunubuganomu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/46663108633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=ear+infection+complicationsPDF 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_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 16616 bytes
SHA-256: 1df8af0dd7846e5728a0862e59a0ce49cf3994a4bfe3f77c7eceb05b4f4f97a1
font_01_sfnt_off00010fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE7 10624 bytes
SHA-256: 96ef6f0deb111c26f4bdd185a7e519514b2bd4e157800be662d5da55657bc21a
font_02_sfnt_off0001282a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1