Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c6635ef72f8ad…

MALICIOUS

PDF

88.4 KB Created: 2021-07-22 03:18:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9402a42f51d8f0150b5a3d336f2d33dd SHA-1: af9f77881110d3e2928232c26a2e153adc685546 SHA-256: d16c6635ef72f8ad15811a0f2350c974825a748440896102bceab33dd24f57b9
164 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV specifically identifying it as a phishing trojan. The document leverages a link farm hosted on compromised WordPress sites, suggesting an attempt to distribute further malicious content or exploit vulnerabilities. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic indicate a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/83cd1374e6769a1f0fba5de84b22f95b/pinalubipop.pdf In PDF document text
    • http://veno2.com/upload/61142495859.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900a1fd26---17048244591.pdfIn PDF document text
    • http://nctpa.biz/clients/5/51/51e593b678cc4707ea5ff7b662bcbdb9/File/dumenibezadosilujami.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6cebbdfe1c492300064040d032fc509f/67315533350.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/tafiwonekenugemolawe.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/jasipapaxedapo.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/28849645655.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160971632cc276---71506879297.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/12710925625.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/4757642445.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/qnv4jtsetdsadvb5usn1cbv4d3/308906776.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c57c089db19---78603815878.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/6ca35b79bc588c990011b92e3c504098/foxezitisitawiponeba.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/49540704263.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/k54pkt2lr77sj97qjnml8bn1qa/waxezetowosuketezig.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160983f6f5a046---xerolozav.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/daaa81135f3de9c3d0d10d24d68f0bff/22995936580.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608409924a7fd---19258307461.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/64308817094.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/wudatesowik.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160729ec4450d6---diwuji.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/51120913944.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/b4c499630dd58fcecc6c01e01c08bd78/4607144918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=business+finance+theory+and+practice+eddie+mclaney+pdfPDF 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_off0000f5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B9 11152 bytes
SHA-256: 680b70cef9c148d73f344cf96576c12e9b72e83cf992cb78cc163513f68a8da2
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BD 16968 bytes
SHA-256: ae07f65bcbe91b34c3a799d399d0e991f54be51f1684bc093bba35d1157dcf44

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