Malicious PDF — malware analysis report

Static analysis result for SHA-256 38c318e3125400ca…

MALICIOUS

PDF

226.7 KB Created: 2021-07-30 05:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 0a2103e55c4622e417df5ec80b9e4bfe SHA-1: 6ba6c4a695a0ff8f736450e1abc4cfbda2cd9482 SHA-256: 38c318e3125400ca65058ad4f4c24e684e2d00ddbc281a338528471602063720
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

Heuristics 5

  • 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.
  • 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://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf63bc372---81942818234.pdf In PDF document text
    • http://debseven.net/UserFiles/File/saxadewiwazo.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e84d0e7a47---kifeximepapob.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df8485f4d5---gelekukedunabela.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b6a2de6d38e---sitiragonifetomizodo.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210609040506.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bd6ed08f1---xudawemixuxipazagifowude.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/682bcd32b36749cd26fd58a527dfeb63/30051449892.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/75477005593.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090bc43761b2---69349237269.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc378f4a947---baxag.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d887e2dc667---jozijewivawoluwirokam.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160808136e71a8---59858294232.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/fcf4a8b998dcf0f05d362c3423f0e7c4/jejesubadadojisutukid.pdfIn PDF document text
    • https://coevent.ru/upload/files/70592096776.pdfIn PDF document text
    • https://istanajp2.com/contents//files/5366059622.pdfIn PDF document text
    • http://refinerlink.com/userfiles/file/mukaxujasavisubusiw.pdfIn PDF document text
    • http://kasargod.net/uploads/file/naforubivi.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4a97666e135266f4d6e36b84bb91bef2/25054393040.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/tosaxew.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/0d98e0a18ce9dae30ef13e5afd07f04d/33770710221.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/fifatepe.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/128bcdd0f8f7ad3d47edd262ea41ffe9/badedevesetudixotewen.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/21082166005.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac15689ac3b---witagomawusazi.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/dc944d16b91d202bb6acac392ae5bf2d/78208738851.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=proemio+odissea+testo+greco+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_off000309d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x309D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000321ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x321EA 32000 bytes
SHA-256: fce3c6d6339b3a8d9f4b8769eb96523d794a9d95aac40541f8bab8ccda051b63
font_02_sfnt_off00036447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36447 10816 bytes
SHA-256: 8dc23ef1184e227b973b864f49fa4a5dc30f0c84b282d144bb0cab77ff1570e4