Malicious PDF — malware analysis report

Static analysis result for SHA-256 0290a573a2532fb8…

MALICIOUS

PDF

92.0 KB Created: 2021-06-29 02:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 04666407fe461ce161f200b26ca04660 SHA-1: 38818fc8acb98773ad4a80c7a51dc59043c64d42 SHA-256: 0290a573a2532fb8c0c292e2edfc71982fbaa1e76c21572726ecf19c2127cf11
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm with numerous URLs, many pointing to disposable hosting or compromised CMS uploads, suggesting an attempt to obscure the final destination or leverage existing infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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 http://iehyun.com/editorupload/file/10270944034.pdf In PDF document text
    • http://adance0112.com/upfile/editor/file/82021369706.pdfIn PDF document text
    • http://954move.com/clients/4890/File/rejafolalalimateduloxo.pdfIn PDF document text
    • https://securitydm.com/slicice/file/sopawuvimatiz.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/77548665553.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1e4e7688a---6172497735.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/12933460137.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/41380874465.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/derasewarozata.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/64465308078.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/tasifuwivukomozodaxatel.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/2qp27v39fsf7vpb77umou04ifd/lelusilugutajejijivuf.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/073569aa1568e1529fb388017dc55f7c/36672422362.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/112c012121c1e435703f711841ee9aa8/kenusafagavarite.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/sukezuviwezajerumererot.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16091be9762897---golorosad.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/4c5e6890663aeb1faa3670c791e8ec4e/sukuz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/cvksn6g0ph3phijr3kqa40gpjh/xugabelarov.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/tovosili.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/lazisiralabadimipenofa.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ba42e6c61---97751677107.pdfIn PDF document text
    • https://pirkitpadangas.lt/ckfinder/userfiles/files/82986815618.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607525c360f03---19251521140.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/8ec1fa03bebfd54f9a3ec970d4789a89/82385803078.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=difference+between+monozygotic+and+dizygotic+twinsPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 17552 bytes
SHA-256: 249cde21a3608be195d9be037c868763c3aefeb30063223d2e6b2d94336f10e2
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 11176 bytes
SHA-256: 48bc26ade3d690b234fd5ba998d48e8806598946eef3af489e72103ce20b15c0
font_03_sfnt_off00014266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14266 16184 bytes
SHA-256: cc48400eeab634603c3f0db54172ab7ae8c3f7627aeef0274f7b6873aed2f2f7
font_04_sfnt_off0001580e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1580E 2048 bytes
SHA-256: 1ae3af21bd5e176ff048669e3cd8b674e6a2fac13689328affe91f3abb31a78d

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