Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efe4848379c2c18…

MALICIOUS

PDF

89.2 KB Created: 2021-09-07 05:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 60a74494c2cb5a3512fc80af06456167 SHA-1: 7057273865179a50062fb45bd906933b8fe1437a SHA-256: 7efe4848379c2c18331a410d28aa38f0c9c90625091c3c90864f3a1bb4b40b78
156 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 0.9961

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 https://ipic.vn/userfiles/file/43842087697.pdf In PDF document text
    • https://kede.org/userfiles/file/pimapaviso.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16095b0bf6eefe---46249205610.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/lafejenixutab.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/jabafonetenivole.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/66e2pg37dfp924mcpoo90ice33/16762925046.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ba86c427---79871596265.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/81069492250.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160be557d0f8b4---tabozozesajekigivotere.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/96181726424.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7f501cee6---pujawuruzazirenubuzutas.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/murujipujanafavuburubi.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/sutivuvutil.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e975d16941---84101539893.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1b2eee6a3a---ninerikoli.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/67a8a40779ad682ff113e9969305bcae/61294139042.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41b8a68b20---nisozekenumotisixapatotu.pdfIn PDF document text
    • https://braveathlete.net/geektic/files/60061861445.pdfIn PDF document text
    • https://sharpconsulting.us/app/webroot/ckfinder/userfiles/files/morinimi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/94928900546.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/rewebarofubazeke.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/rabofebakamatikapariwaxe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=new+beacon+bible+commentary+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_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 19452 bytes
SHA-256: 1c34f55e322d84742e7d2f14a881e6ec993ea3646582da4382a5b2b9b2d7002e
font_01_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 10928 bytes
SHA-256: c5ae555091799112c91b0efb7a5b1822e02b6e87779fded0b1ddb06a05875f0e
font_02_sfnt_off00013f7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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