Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f05b9dcb8efdaf5…

MALICIOUS

PDF

86.8 KB Created: 2021-08-08 04:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ec9c2217b212418a045ae0d756087ef SHA-1: 1a3e5a94b6d3938f60a9edb411da1ecdc54c7e30 SHA-256: 6f05b9dcb8efdaf5762f087cc901e16d45df2b5177d7980111fc326f61d10aba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to download and execute additional malicious payloads. The presence of multiple external links pointing to compromised WordPress sites and disposable hosting further indicates a malicious intent to distribute malware or conduct phishing attacks. The ML classifier and ClamAV detection strongly support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/82113b02bba310e653d622d6a4a303e9/borep.pdf In PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ba10b0a0340ce6113b20c046bd284677/kudixevu.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/11833989729.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160917ac4acb26---45816035293.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/2csa8e113q7e17kkk0cuqnf5lr/kotepufodo.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb415c43dfe---23115993820.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/tonazosuse.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/07b5e2d5e0a2f21dc6b2075b28d643f0/97218652114.pdfIn PDF document text
    • http://deauville.ru/files/file/80888216914.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/24cdbfd24837d71151e6981492286456/95001158780.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/kokebubokisanewam.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-8/20210808061851958986.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/25953034511.pdfIn PDF document text
    • https://sayurmateng.com/contents//files/99429619655.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/083982b578eca9489de9281a3672ffad/detifojifumoguw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac00389912---6441301658.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/timasusin.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1g9557pjdilf5uma1ono1ccf9s/bagowenolugejokosikefewi.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9834eda4c4---27123077278.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/96426252094.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfd3e3dbfa---zokawomebatinel.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/rubebenosowepilat.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091243412967---76464015208.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/terixisanalunafakevimuv.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608762338b435---20352141588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+download+shia+islamic+books+in+urduPDF 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
stream_007_off0001288b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1288B 20848 bytes
SHA-256: 764ac02124b88fdd98071e995abf32c6cd5de7e3c07ceabd29a41e866aa50820
font_00_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 10932 bytes
SHA-256: b9a82351c086b64d90da1b70dff5f0bcd5a1c23ee8bcdc5646fbef7a2989b34b
font_02_sfnt_off00010058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10058 15696 bytes
SHA-256: caba018d6e04f1b1d27b897d1f20e509ad0716619574fb28e76b2c12538be54a

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