Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e191665ea228c94…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 10:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3f195a0ba9bff5e6122d31c8df54fa7b SHA-1: 27c6ded48ce60d7827690c0f0df060e67ffbdb4c SHA-256: 3e191665ea228c9466c1777de6b483fb5c71d7f0e7298b761ffcc2342734b1e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://rnralpha.cz/res/file/zigutoramimur.pdf In PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/64520493166.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/delupupiloje.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab9e941c86---16499239854.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/sazivetas.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2404bd64---38445821798.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/leveturumoju.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/busikuwesaselenifofevox.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/waboxifexebamataja.pdfIn PDF document text
    • https://projetovm.com/uploads/files/bodopusivud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a086e55cf8---26556500114.pdfIn PDF document text
    • https://majubesar.org/contents/files/xafumasokapovi.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca90b71cb---64690409585.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16131417d882c2---24183972310.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/wudajovufinuseme.pdfIn PDF document text
    • https://borgopitti.it/userfiles/file/lorilimudikutafovaxoxani.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317e8c1feaa---gogowofatezabakuzibul.pdfIn PDF document text
    • http://garderoba.sk/images/_file/41809658757.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c11597dd9c---11226857988.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/navim.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/9605185071.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/54465721927.pdfIn PDF document text
    • http://theponghop.com/upload/files/12431953557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=screen+share+android+autoPDF 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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10596 bytes
SHA-256: c721d3bdc7920fbbf133a03842899f96b758bf76ebcb83490d915dec0adeca88
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 17140 bytes
SHA-256: f27dfd799856e74e26f68512daca64d23e261524a0447462670a5b34fa402536
font_02_sfnt_off00012181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12181 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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