Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cf1f58bda1d081…

MALICIOUS

PDF

72.3 KB Created: 2021-09-02 04:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b741247e35f6daa1653b18789e2ec57a SHA-1: 6f18414e26409d23b7303e86e91b8409c5a6e292 SHA-256: d6cf1f58bda1d0810e046994c6e49129c040299191c184c0e6b2902e09ec04ce
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to compromised websites or disposable domains, indicating a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous URLs suggest an attempt to lure users to malicious sites, potentially for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://chcial.ru/uplcv?utm_term=immiscible+in+tagalog PDF link annotation
    • http://msamerica.net/clients/873634/File/tokez.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/48016380524.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161135e0b6d2ed---54498051453.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b38624bdc---4076402702.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/bebige.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f5ccb9ab642---sujoledogipibalivakugow.pdfIn PDF document text
    • https://hsse.cl/files/4777547226.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/18865404751.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/posugajot.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1f8fa3f05e64021962f724af1a87a149/xikuwesaderiwu.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608303a45ee14---62984773359.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/61d2f56ab3b4e4cb727ec6d6a787d21a/sitejarosinetufedizag.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f05b32d526---nuvazuxoduxukedasamexe.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/bolutivizazasel.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/bikixizufirukowopum.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/40190014622.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wufupudofijexo.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/nuzofibovisabujaz.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc28bd5fc---lizaterugidibiwiri.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082d1c8c35a6---24131573739.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/wenamexolasekemamafiw.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac3820bb7---jakuxipelobegagudadi.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/71272891286.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/sumigubojikalexutadi.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/gatoripezupegivogag.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_off0000bb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB34 15740 bytes
SHA-256: d16d2f83b5b30afa375b31cc96a926cd62ae6859b8f732e9747ae6b27a38700f
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10564 bytes
SHA-256: 4506ce5b54e46149b5a15e4579fe1559e92f5f64c27110022bec5e6f6948a3f7

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