Malicious PDF — malware analysis report

Static analysis result for SHA-256 db36a20add94c839…

MALICIOUS

PDF

71.4 KB Created: 2021-09-02 19:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9e69016d86d36ac4c4d5de18af0ce89a SHA-1: 8e7c46f600b93d1555be0195d3538533260a26f4 SHA-256: db36a20add94c839dd6ab5468d69a507647ab34dda5069450330869539d8ecb6
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=exponential+regression+model+worksheet PDF link annotation
    • http://boldogelet.hu/media/13301684434.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/ripadalobejiziruzapuku.pdfIn PDF document text
    • https://www.rockfallco.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0f0dd7eba---46614417067.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8867d792d7---sajovefowipulezazaj.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/82379567426.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/waxuliwizivofoxo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3b18c5bb52f4bf6a00a6cac8d0840229/1289984688.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/50855503864.pdfIn PDF document text
    • http://intertravel.hu/_user/file/nipomarul.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/bivapixokipezowur.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/70174033756.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/67354109476.pdfIn PDF document text
    • https://dintek.eu/uploads/file/63464001183.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/jesowag.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/87299036637.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c14550766---xesuzomaxosawe.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/for171c54o1qtkkde8qtdi056cufnfmf/nonozipoxinabibovumuk.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2eaacf9a6---nitoxetarubimimatilijuvu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d73165972---boloxulezokidenujodav.pdfIn PDF document text
    • http://medica-brno.com/files/96366600648.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/4ndnmpb13j97sb2f981mfsqab3/11864151947.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/bcda16490e3296327e08c17fc42b0e56/2480517450.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e8c4e2f85---mefino.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_off0000b5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EB 11104 bytes
SHA-256: 0004a95cdfe088fc9f05a150208c7b0efca0efa7e4ca002036b01a23043f72b5
font_01_sfnt_off0000cf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF71 15728 bytes
SHA-256: cd8b6b7f97e0582d8183cc38a9736d6442cc5525784dc0deaf0b4e191f98b6c1
font_02_sfnt_off0000f809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF809 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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