Malicious PDF — malware analysis report

Static analysis result for SHA-256 43c1ad77d4ceb300…

MALICIOUS

PDF

117.1 KB Created: 2021-06-10 10:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 85e8c6eb1c9e1eeff6bd3084e747fd45 SHA-1: af80138dcac4fbbc7745c0bd1973204edd26518a SHA-256: 43c1ad77d4ceb300be3c905a27434e5a48c46ac6af611d7689fec97325aea292
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and 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 0.9995

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://ketchas.ru/uplcv?utm_term=digimon+next+order+digivolution+guide PDF link annotation
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa5e351d63---wejolovatode.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070180e06799---fovap.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/9jof9smcjp9226m3mr5vf4ni8f/wotifalujepopokumovemep.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d37b16a30---rebuvuzawanakoleralux.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/96271977027.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/60398142108.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/2k94r2uvq5f0lc15pcku2mt317/71575427278.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d5f54321---sosaxewimezozo.pdfIn PDF document text
    • https://capecoralliving.com/media/file/buseben.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e9c3de777---46514551710.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab91d667d50---jajefaxawem.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/godanivafoz.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079edf963436---17261148976.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015076.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15076 14976 bytes
SHA-256: 739063fc87d11e31a0d5497daa48ee7fc32e2f0aa1f79ce46adf1c3e426efc77
font_01_sfnt_off00018127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18127 4768 bytes
SHA-256: 47b5951dc0355229eca69275ae602e9b4915db7d24ea9c3832de4efc67509b0b
font_02_sfnt_off00019148.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19148 12080 bytes
SHA-256: 7c94f90b76b9fccce0fda3561d0c4bdb9bca0e499aca0a6cd732bd158544bbbd
font_03_sfnt_off0001b8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2