Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaabe50d68f0976…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 20:12:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c7cc6036d1d261864146fee0a47e3c66 SHA-1: bc4461745df699999ab6c7cb7919140b158ba807 SHA-256: aeaabe50d68f09765b2cf27ac8e860079b36b43f7291b8e1b741e4d9de0d2379
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting. These links form a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=combustion+in+si+engine+pdf PDF link annotation
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607c729a9033a---tupez.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/jojikumavokonuruxatizedew.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/robolemupoxolezufiwegepa.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/96eghdh279chlfdo5jane1ddo4/14965850641.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/gerusadurowotijilijodoz.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/fesiwutuxewokuvokaxaxibo.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/marirerogazijabe.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4c3a236e0---xijexowikevekelagusevodi.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16071896acdaea---4299345369.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e1251b69d2---34851390060.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/wigejezironuberif.pdfIn PDF document text
    • http://www.motocams.cz/ckfinder/userfiles/files/tiwemojowatogokatuvobude.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/selidagupa.pdfIn PDF document text
    • http://zeci.nl/im/image/zurizevod.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609834a9771e2---33689043115.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/sopavumejudojigowok.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/pajosudofofukubotu.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210702023614.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/cac9465891d37748c13fce4026bebe5a/lukawurufo.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/504eac0156a368acf7f5ec6059735112/58313147113.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/52811c6cf61a3b7ac51a2a11f10b4c0e/81952562180.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/bexusafevamazezes.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/zajizipizufo.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16102578e1a0bc---pipav.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/78867918470.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_off0000dccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCB 17364 bytes
SHA-256: 40ba79ead600da1f329bf19ed250b2bbc60f72fef6338b254a482cd5ac1894fe
font_01_sfnt_off00010956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 10804 bytes
SHA-256: 59083067e10c2b9bb1fbef6a9eeb57edd87570a537b2375193fa43934eb493dd
font_02_sfnt_off000121db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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