Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdd3ca058c4bd5fc…

MALICIOUS

PDF

87.4 KB Created: 2021-08-01 17:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: afa05ae51d1b54b6efd0ee0547ad5d8f SHA-1: 9ade7c1260ea14c87c4ffe138e3819f1c7fa0d13 SHA-256: bdd3ca058c4bd5fc3d442af648d9c40ba8fd70aa25ea4d28482bc3e5952d95a2
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple URLs, many of which are hosted on compromised WordPress upload directories or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or deliver further malware. The sample's structure and URL distribution align with techniques used to obscure malicious destinations and evade basic detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jyjwqj.com/uploadfile/file///2021070921281258.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n4fratte4mdm4f79uf9ak6pj64/konetavobugodokug.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/49449707519.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/51396869d925e749c702c910f308e690/33441446937.pdfIn PDF document text
    • http://ha-sine.com/d/files/koruwaresosewetutup.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/71786799540.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/53tlddsl53g3e7dkr1i6ln9nnd/buniviruguwopawexaza.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160d33061e5744---43131033944.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/g87tmavcmo0io4oed55r5g7hr5/pugojonefo.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/75762968505.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/2ffe7cc29556cd0449c7e5f72b46870a/31932699381.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///1077439108.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c599d9e1bcf---32161931634.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e147e595ddfd59fb4f1587e8f283a9c9/19918833079.pdfIn PDF document text
    • http://bradleyhillsapartments.com/demo/uploads/contents/file/53669501529.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/dilogenanulikatitigo.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4c32dcf8fb055269afeb9ffebf145f45/lawokanereketaj.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3223ac113d---56986891897.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/42103343695.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210705_130821.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/f1a5ac4146f7cd2354b33d3a320bbb77/rutawajirozepu.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d8183857456---87395444856.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=benro+aero+4+manualPDF 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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 24692 bytes
SHA-256: a2d7263e23a06ad7c5d92c3f39de1b788ad3bb3e5c29d83d5b7e9e1abb8558d3
font_01_sfnt_off00012025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12025 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001383c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383C 10144 bytes
SHA-256: 09c9b62b5df618480f7edf7550567abe6b4b8fe5769df6dea0abfbf65881b0bd

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