Malicious PDF — malware analysis report

Static analysis result for SHA-256 d751ec74aaeb598a…

MALICIOUS

PDF

93.4 KB Created: 2021-07-24 16:19:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7123a7c19661441d7e1cfc3db4a46bae SHA-1: 2590587daaea188f8d6d719fc1cc5070fec74265 SHA-256: d751ec74aaeb598a41a8870cf8eaf62cc9a9bd97205df7cd511cb3c8b2015c86
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF also contains numerous links to external sites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for SEO poisoning or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://luyenthitoeic.info/userfiles/file/32025011507.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cc382d1f31d---63784212126.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/famozuwiwofoposutevizora.pdfIn PDF document text
    • http://artospace.com/pics/file/45519631904.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160ae61fbd0252---55347249321.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jowemabupusojomomovaxef.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/5917736980.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813e5463c7f---26408532406.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/e71ptto3vlgc9m9rck2npuaka0/xuwetajidawuzos.pdfIn PDF document text
    • https://telorgabus.com/contents//files/weluzafatavopid.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/72877222329.pdfIn PDF document text
    • http://rcsiprojectracker.com/userfiles/files/36618822061.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/6cn01gm2436ilmd1hitpes2s5g/98050215565.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/79cccb65ad0b69eb256afb416b5c96f6/16541400572.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf0db8630---melebixolabejafubu.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kotumivoxowusewafoxetu.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/soman.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/ln3uj1knrc547vt5l9egor0aum/dewigasaj.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4b1a33b97---gavumobo.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/93300040087.pdfIn PDF document text
    • https://atl-50.com/files/file/tokepako.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/ziwabaf.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/raj27mc91vok6jlr88ddo5u361/pezuguxowas.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/kisaxawadomupososoxuwiru.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/75154824093.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=best+night+spots+in+atlantaPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 17536 bytes
SHA-256: bfa05e21816428279cc1b64ec0118d426e7271f1b8c648b1104edb35758b5f8c
font_01_sfnt_off00013598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13598 10484 bytes
SHA-256: 5bd1c16dff4572c7bd7a0fe50ad8187b75f30a72417a1f9d1c6fc7befd0b025c
font_02_sfnt_off00014d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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