Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4e0bb3583e0ab5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-05 14:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fe847ecf5bb6afade3c8f7ead6a0ddda SHA-1: c04d5469956fd3834dcf10e4cacc7ca99aa25747 SHA-256: ac4e0bb3583e0ab599b2c50295ec2e8ce6364c4b689a327ed0be949fd5e9c1cc
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is intended for malicious redirection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kontiko.com/ktkweb3/images/upload/files/62325636893.pdf In PDF document text
    • http://vlajamo.cz/images/file/nabosijudukizetejuvifizog.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161274a48a00bb---mukezupuxubinunig.pdfIn PDF document text
    • http://airfa.it/userfiles/file/zamakosexuk.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/03e11919d688f7d148f1c7b3ef2a1f84/gonobeneru.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/64633032722.pdfIn PDF document text
    • http://polletnv.be/uploads/files/rigoli.pdfIn PDF document text
    • https://stopserv.ru/files/file/ledozupunikaj.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210618_A08364A69C063985.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/popexuk.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/nedeguguj.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/tupekirelalof.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/kefegakobi.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/19713184419.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161273f145313b---fobolikaponifuxuratetobam.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1500244cbc4798d1a64aaf7f297a5367/12772729441.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d56d418966---rizorejavi.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/vapidujax.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/51375706791.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8b37893ce---35097955908.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dc98d37d296c3d6518f2a9da739a0cf8/kojonanoxutujukiboliga.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160739d542bdd9---gujozisusozuzadunotegoba.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd48329aa11---wonogurazugajekezarika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=400m+sprint+training+program+pdfPDF 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_off0000d49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAC 17660 bytes
SHA-256: 684a812af490eb6416f53a72b13dba5bbf100f51066d68494597c22dcf850060
font_02_sfnt_off00011a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9A 10768 bytes
SHA-256: 89a9a331676d56dc77678927d2cc8151f8684388469d5e560bac9a22de55b131

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