Malicious PDF — malware analysis report

Static analysis result for SHA-256 36aa1bb18d7e5a66…

MALICIOUS

PDF

87.7 KB Created: 2021-09-12 09:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 407ee737dd0d8935b9da899d8d387b3d SHA-1: 3d429d38ccc8a02cc4df54fe6a653365bbf24790 SHA-256: 36aa1bb18d7e5a665be761a77a9689afecbacfcfeb9cc07fae0c8faa9ebb2ec1
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some hosted on potentially compromised or disposable domains. The presence of these elements suggests the document is designed to lure users into clicking links that likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/57468540266.pdf In PDF document text
    • http://harekatmemuru.com/images/Media/files/vepujalujoko.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/pisekosutogirosemuvax.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/detevadijumibomagefefus.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/vofigebodakufetezo.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/ae8d987690a4521c9099a1cdafef774b/39669216143.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/gifafarosesukuvajoparuji.pdfIn PDF document text
    • https://0955205219.jwa.tw/userfiles/files/wegesimijis.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339c7f3379f---dexibazipus.pdfIn PDF document text
    • http://martonelektro.hu/files/file/48959092555.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/sodutupofagu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/tolus.pdfIn PDF document text
    • http://kammed.com/userfiles/file/25912293596.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/45513738074.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/zavosiworeja.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f464a40d8c---27028749297.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/a22a1acc7cb87a009fae51df9eb83234/47548746003.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/2481283408.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/16769839557.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/vajot.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/setoliwe.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/23165617497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=intro+and+outro+maker+mod+apkPDF 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
font_00_sfnt_off0000d923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD923 17700 bytes
SHA-256: 3b84e7ee5d794be7343e87c93415ee44774126402452910612571d25116a1bc9
font_01_sfnt_off00010757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10392 bytes
SHA-256: 7bee6ffd3b2cb0dde0351e1dce02e54e39f37cf51d971a4ed9a00308a0064c95
font_03_sfnt_off000136e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136E8 17208 bytes
SHA-256: c9231fd60681a554f7d70ef88a68ceddd3e033ff18e7f79ee165524a2267aa87

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