Malicious PDF — malware analysis report

Static analysis result for SHA-256 836a78fae3854595…

MALICIOUS

PDF

92.0 KB Created: 2021-07-31 18:42:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc0ef9e36b23d6c771e79bfd2fabfcbd SHA-1: c6fd01b9d79a33047ea1145f3c25e223d171bc09 SHA-256: 836a78fae3854595c7ac93028ab94f82631990c0086bb09a22e8a47ca4fadaf3
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a link farm and a lure for fake invoices or payment disputes. It embeds multiple URLs pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to deceive users into clicking links that could lead to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://wastran.ru/uplcv?utm_term=how+to+pay+delaware+toll+violation PDF link annotation
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/3f1c528b2befd1149c0ba1a14074d344/6694508038.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f311b6f9f---48152817358.pdfIn PDF document text
    • http://maybomchuachay24h.com/Images_upload/files/80954113666.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/tisesozubuxegixiforipelin.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/82566568687.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/16359865013.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070020baa3a3---fikegud.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/getemikaf.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/somozanubo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/64594582291.pdfIn PDF document text
    • http://vejwun.cz/images/fajanudif.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a91acac127---tepulofozitonefavu.pdfIn PDF document text
    • https://clove7.com/userfiles/file/fovimi.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6506ec736722b9645ecbc1b0ad6185de/xudogukewatoresawami.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/43acc95e171ec517b36e8e85ac01397a/89872416543.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/7us7huqar72pcmqke3nal5bme5/48930765279.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/80491063119.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/35765943175.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160af825e5cf51---47692983993.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/58356698737.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/70487697008.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/sopusojuluzina.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d248153e02---wupapukibaf.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_off0000ff8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8E 19808 bytes
SHA-256: 540f2a66032aec1a409af7bb7725b60d709908ed7f82bfad934367bc74700d22
font_01_sfnt_off0001326e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A85 10476 bytes
SHA-256: 50ad0acf5741bb3786f9f0981a8463ad59df52afb2be5599ff4ab49485426033

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