Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a88d303f652d08…

MALICIOUS

PDF

86.5 KB Created: 2021-06-28 00:19:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 2b6c05304c27acda13f09646e65220f4 SHA-1: 3af546965bdc62ddc62961756669c33548a1a150 SHA-256: 81a88d303f652d08f85e047f407f26b5d271cef83533b7b00d7f7e4372eeee4d
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be hosted on compromised WordPress sites or disposable hosting. The primary goal seems to be directing users to external resources, potentially for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://chcial.ru/uplcv?utm_term=p365xl+with+manual+safety PDF link annotation
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/516d072e844b9b1c7b76de6bea32e17e/bikapu.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c900d9487e---42645656539.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1dc8c2cba---52876680710.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609262d81498e---68777892238.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fad18de9db---tuberokukujinosudir.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/nobasuzawefosigar.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/85512342987.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/xujew.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7e4a026b1---88435546008.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3a75a8dd2---xijofikir.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f62513243e741318366570e5963f2eda/51513516295.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078cb4fd075e---wutubovitirutu.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/s5ne0hrdd48d74ohck1dga5da5/57574490022.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/39509098295.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/es5qq6o4hno2jtjv3hsh37317m/vanuvubufima.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/53431799603.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/67787ae0082c07e73d7955501d51d916/10954462789.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1dc6df9e12a3d7a994c1b7f6a2e4fcbe/11662954387.pdfIn PDF document text
    • http://vetranhtuong.info/luutru/files/54280020210.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/xapofejodapigi.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/40925348794.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10571 16984 bytes
SHA-256: 52c1dc963e9825dabc34c5daca75dc0e3fe1eb18140c0f5c922d8aaf50561f7c
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 11136 bytes
SHA-256: 07d25df56a9a67fccbffb43ffd394c3537d19f3ccaa2e77e90de8b5014a61d3a

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