Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c42628eb4cf40…

MALICIOUS

PDF

71.6 KB Created: 2021-09-06 20:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45b273516c81206985989811efa6acb2 SHA-1: ac8a86ea0925abac0d172b1898faadfb8f9dc1ea SHA-256: 091c42628eb4cf4043dff724d981bccb0c84c1332dfeeaa20f4a298360c0cceb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. The heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised or disposable hosting, suggesting an attempt to obscure malicious destinations or manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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 https://moolans.com/uploads/files/45304225726.pdf In PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/70028472600.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5d72683bc1babbc09649bfda66b06299/6294855937.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac41e83ed7a---85315242818.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ba627b0f3---65636154064.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/14254157194.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c91691cf3---43512110542.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b8966709638---20498621224.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/jamomanoxamomuniboxuxiga.pdfIn PDF document text
    • https://krono-original.vn/Images_upload/files/juribiguwataz.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/74337150759.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8bacf280a---85056282957.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/99883620007.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/sudusiwikemofazodo.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/subegipepad.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/70006320284.pdfIn PDF document text
    • http://mulherinscampground.com/clients/879992/File/nopezerutos.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/62606729879.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/vudaloludikazekeseta.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/01f01e8b92e9d23c7665868c2d27c5fa/38523905593.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160873ed8c3bec---88600589799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=red+led+datasheet+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_off0000b5ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BA 17076 bytes
SHA-256: 8d5afca28cecea6411241913d7f8a2899f97ddcf939a3c4a9d492fab028b412f
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 10224 bytes
SHA-256: 8965b460a07575bd9ed2e0fc70639a53ba4c769b3b31efbd617d17ae791d6046

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