Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c48290c0b75494d…

MALICIOUS

PDF

72.2 KB Created: 2021-06-30 20:03:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 81dd9165d95fff95a34e7091e5a563ee SHA-1: 2e42220d9581ff2dea2dd34c90d737ef047cff5a SHA-256: 8c48290c0b75494d649971cf1d842890a6296e772b8cb524807228356637ec63
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution through a link farm. The presence of embedded JavaScript suggests it may be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://constantcontinuity.com/membership/data//files/56233348467.pdf In PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/efc39134f9772f07e705f7e2de71fa60/bowagefifarugotadot.pdfIn PDF document text
    • http://127.0.0.1/kardelenemlak/upload/files/fabowovafiseku.pdfPDF link annotation
    • http://synerfreight.com/syner_upload/images/files/neduj.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/dhtfl42i6tv76hadi53eonpali/30949656244.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/bunikemonokerelokegawewu.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210604_EF20FE2E722A8113.pdfIn PDF document text
    • http://digifast.cz/userfiles/xegarabomorumepotusofepul.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/9a35ad6d88e3daa55bbe2df85654f826/fevef.pdfIn PDF document text
    • http://tantos.jp/js/upload/files/38197908095.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160949021d757b---38237798304.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r6sbebc8uu4b87gufsm8q9njvs/23138301014.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/e36c5d0ad66fef67ce213e48d3f2ae21/berizefifukenas.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d31b28e52---739576306.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/25594492555.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/796e0f9fefd5a378a2eb1448df59e178/zabunopetonijuwamurig.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c82f4eb5c8---gofazopusogoxexore.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/87711453302.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/18687742989.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/musugaliko.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b460e8bc83e---52263342671.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160c69d16cf845---85660821275.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=public+safety+center+stanislaus+countyPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/34114169010.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_off0000bb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB79 15356 bytes
SHA-256: a709e09be16b194cab7c61816a191b72a45513a3e16d304f0930b25794e0f09e
font_01_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 10684 bytes
SHA-256: 61428d5e19ae33749935948350ab24839c9bbc62542cc12224f2d56f1e15254d