Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d6faf2b3253fd0…

MALICIOUS

PDF

87.1 KB Created: 2021-06-28 20:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 997622f3397ba60cbe2700a55697361f SHA-1: 3bba05382574cd2b5dc8f1a2061647ce9f7f3ab6 SHA-256: 67d6faf2b3253fd044c5abe8db2834cadd32fb4abebd02a8662082f35445090c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be directing users to potentially harmful external resources, possibly for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/1a35d8c8dbcae9b64fc45c1a05e991f3/6993512668.pdf In PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7a039aa519188cda534a1693a29446b2/16402717090.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/58547043007.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd501d1cc93---56552050391.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/256ed71aedfe60ca66ff629c61e7230d/vefub.pdfIn PDF document text
    • https://preciseenergygroup.com/media/kesateledejavapifokimid.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/0aec59d1139cd475d1d54671a6b2873f/tiwivoguxiz.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7ejdu714u33i4a0h7b7tgeojma/4005754617.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9fe86c9213---94195863576.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/xaxilo.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/72f6f0ce61a2802ee3a10879426a3756/vevagoviviko.pdfIn PDF document text
    • http://sequirk.ie/userfiles/file/todapinalagumuf.pdfIn PDF document text
    • https://aspirans.com/files/file/93069475580.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/63295132457.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3141fef66c---5838995039.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075dbf18246a---jamakozelizo.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/34564928894.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d967bf27c---nesilugexilumaso.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a2729e9b3---sozomonazadiwigus.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609304ea25d0a---fatokitamunex.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/49066b4af304b064d6366ab3040e4b97/gonomidovobaxonezoza.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/4956f640fe7c8bff9ed39b7b72252907/mojebuduxogagewid.pdfIn PDF document text
    • https://n-zvuk.ru/upload/file/bopusala.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/58031422809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=causes+of+pain+in+sacral+regionPDF 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_off0000f329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF329 10688 bytes
SHA-256: 809d1d4dcd72256cd3172361b1048b3c6cd7e1e93798717914dc6224d1eba1b6
font_01_sfnt_off00010bcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E1 16616 bytes
SHA-256: f382e878d8f25557b266b7555dd681eec187b9d79930e86c231a9183c4c9a9e7