Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16cc3ba3827ef26…

MALICIOUS

PDF

72.8 KB Created: 2021-08-27 00:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d71885cd2269252108a1a257f94629f4 SHA-1: 10146eef863d7d08d196b8bc8074203566850e4f SHA-256: e16cc3ba3827ef2601986b3003aebc4543571289ff8b0fc85b61159a14d37462
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The primary attack pattern observed is the use of these links to redirect users to potentially malicious sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://coretry.ru/uplcv?utm_term=ascites+scrotal+swelling PDF link annotation
    • http://rrbrentacars.com/files/others/97119357577.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/83213168707.pdfIn PDF document text
    • http://ttc-investco.com/img/files/serixatavofovor.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/u1r7l9dbqeh8k59nbs6tfad5hc/685664512.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b5534cb1ad4---37561265267.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611652c389b43---19410778323.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a9v6v4g3n9hbaunp4rqhjr68m7/powus.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/vekabaxodobijesefifix.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/dubarobaso.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/75440031878.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/77164484607.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/aaed1fd197b580e9a0e1f904b103803f/bubibumedo.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/kixuxalu.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/89001388892.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab3f8e5eae---24331081121.pdfIn PDF document text
    • http://transporteslaplata.com/imagenes_web/file/ranisarem.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/46783788225.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/cc27fcc396bc4da8b857d3c565bfca7e/wonixiboxovajiwonanedubo.pdfIn PDF document text
    • http://laduses.nl/image/file/vefevirexofadasiwe.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/matoxemabuvinunarogosa.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/14113189230.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/tojewuba.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/1e9370ca4d980ee78b7220d67c5c52eb/26137059173.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_off0000bf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF0F 10472 bytes
SHA-256: 85eeb939106e885d06289c585616592a6b6bbc6414660606a23ef173d1c4625a
font_01_sfnt_off0000d714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD714 15328 bytes
SHA-256: b6ee9e0ba5f1b8095cb53bcbcc68a91cca3dcc27245bb52b68455450af93bdfd
font_02_sfnt_off0000fdee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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