Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a56d53cb347ef8…

MALICIOUS

PDF

94.5 KB Created: 2021-08-21 22:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: efc1e875260fcdd761443084ead0c061 SHA-1: ac403c3ba1200e517248d3e0f06c71fa9a178f69 SHA-256: d8a56d53cb347ef814f781100f9a6a148b03954d3b80f7f8afcfddf3c47b7ce7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs that form a link farm, with several pointing to compromised WordPress sites. This suggests the document is designed to lure users into clicking links that could lead to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://mousike.it/img_ins/files/67963157273.pdf In PDF document text
    • https://www.verimevzabavu.sk/ckfinder/userfiles/files/rusosefupewepig.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/levanemeboro.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/1e2c5ea1fd5da3eb083598ee20c4ba7e/xenixifodu.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/nulusojowanidogawiwasi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/7490f8361ef953e8de266875ba7e0687/34893702040.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f865abdacfe---79438830093.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9eb8e80c7c51a6d8244ed700aa626a1a/48577560651.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/soladonewekupuz.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097d0a2eb7b7---40365660861.pdfIn PDF document text
    • http://geonatlife.es//ckfinder/userfiles/files/jolewojedupejatavazugatun.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/bezudatobajojogixodoxaf.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/28175450947.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/4u9adno4dglph03cvq0lqo4ahd/87509013812.pdfIn PDF document text
    • https://bouwservicewinthagen.nl/userfiles/image/file/85139677108.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/29692613092.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/7543553758.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8df0cb8f86---99253552443.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac16b12fbed---9862294826.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/1fe4011c6bd3e632109c75d7c3be74d8/jogudem.pdfIn PDF document text
    • http://orhs89reunion.com/clients/77823/File/wakavezufoxulibabu.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/46249936402.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/30379188902.pdfIn PDF document text
    • http://trivio.it/userfiles/files/9200579707.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=rider+waite+tarot+deck+guidePDF 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_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 17516 bytes
SHA-256: 9c1c959726ab31e5c9f5f18671deec9bf51541da7f8aaeadb35ce16142b284f1
font_01_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10548 bytes
SHA-256: 8492262f2ec5de9b0289ffa0995bde97a1d7b08f800e1d2859cadd4367fd69b5
font_02_sfnt_off00014759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14759 2612 bytes
SHA-256: 3a1307a9e51012f8bc77f1c6f111748c9def541263f6c87c301d016093721792
font_03_sfnt_off00015251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1