Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cbf72951e4e2bcf…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 01:02:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0a71651ccb155a88c21054b6b4475884 SHA-1: 8556be2adc0e17fbf1f5ac72b4c3b781dd6738b6 SHA-256: 8cbf72951e4e2bcf1c513c537c13006103a5879cf2331a95dc6f757171602ec9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attempt to redirect users to malicious content, likely involving embedded JavaScript or other exploit mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://medvor.ru/uplcv?utm_term=front+page+of+lab+report PDF link annotation
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/63b9a916e152b8615b13c01ad72745f0/nujudisizob.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/95149262416.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/5642500077.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce94010a749---5334013312.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160986c25b99a0---nedifaguteveretegevavi.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4952ebe394b23a68259da45161be6049/visotajateso.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baff7e9757---37803045327.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6894107a7885af0ddc059cf494d87251/sexagikegopuwubuxetogif.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/f14ab541601b54fe43c08ce2ba9209a0/80542704147.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/f1078299f38c44eb1f7fed173fb3d59b/zawumijexemezafazovesobi.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe7c9d6bf---11031385829.pdfIn PDF document text
    • http://ehsclassof64.com/clients/b/bf/bfa5c4411462ceee4a19e543862d902c/File/nevodewukibawasagajab.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7190f85cf0---xuwarixujaforapapidigu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/3736df8632172c5cc4d3cf8f24a5d5a5/61036314967.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/gotawodajaxi.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/66306687732c977c1fe1486c4a9be219/82215709214.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a312e7a4ad1---611312416.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb24f24fa84---53896534365.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070036286ae7---dezazuvujowerurop.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093aa8794bd9---luzepowazadofovuzomixox.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/66add14b1d942b3d42b297554a0807ad/xetupixomonadanizixufol.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/dapolo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acff816d8df---50427705741.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/5d98d6099de417f69424970834389ea4/11031780076.pdfIn PDF document text
    • 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_off0000ef5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17556 bytes
SHA-256: 40bc3e7f78823dbd19570dec041efb66fe06798791efb8d5abe83cd10af772f1
font_01_sfnt_off00011cb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB9 10392 bytes
SHA-256: 5e7ad78b3c55762770755eb2bdee627bb74e694bcf83097d1c4713510619e34f
font_02_sfnt_off00013423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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