Malicious PDF — malware analysis report

Static analysis result for SHA-256 370ed987572ef93f…

MALICIOUS

PDF

92.5 KB Created: 2021-07-01 16:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5f56fb6be71bf6eaa4a47610fae91979 SHA-1: d6360860d743b88c0648f95a2053a6aa0f7cfe62 SHA-256: 370ed987572ef93fe4efc171f244ea516984e79899f60b2f9c3f1ca22417a4d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites and other disposable hosting, likely to host or redirect to malicious payloads. The presence of multiple external URI heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • 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.
  • 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://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/525c383578a169b6037f9b757efa3d05/wutaz.pdf In PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/ut281qe5uj3spmhs9l4hs58k0t/66927739832.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/114add208398621c80b5679c0cfc1aac/10614486726.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/90891692858.pdfIn PDF document text
    • https://majubesar.info/contents//files/nadaditojimasediburaxogep.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/gerozeriwedu.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/69411147218.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/qdckolm1a68aikkrtbebiue0l0/semetojifisagipozakirok.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c94071cc3---83875310186.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/16826172207.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ad805bbfc78---povoxege.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/80975334041.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/30166835482.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608625f9e31cc---valolakadijer.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ecd7b57139---66696007889.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/liwazupiwifo.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/e136097a7d3d2c8fd469541efa10065b/27161946617.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce5e64a78---16746362216.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/15110767612.pdfIn PDF document text
    • https://hoalavender.net/upload/files/56333570249.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/1910614587.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3de109ea4339210e6e5692ddcee0acb5/sasivuvezetazizawobafidap.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfea1862dc---torajoxo.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38bbd26202---jelukikafisibufapomebegow.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8vajjjdqg8cqebhjk5h0477qeb/simijavivires.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=the+book+of+lies+pdf+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE8 10676 bytes
SHA-256: 447919934df851b4ecb3825db3bddd9e4b85b941e8b0d58cd89ca79fe0f1bed1
font_01_sfnt_off00010722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10722 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_02_sfnt_off00011c53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C53 18104 bytes
SHA-256: 25a2eaa8ea77250e49dc7bd68dacbd430dac8afe71a1ec82bc7c28a822eca144
font_03_sfnt_off00014bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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