Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2554c5cf1cd9e8e…

MALICIOUS

PDF

72.6 KB Created: 2021-09-02 12:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8595f168143e27294c54e1b2fd1e2f1c SHA-1: e4f1ae614a22b53c3f442cc36d18db1bda09c9cc SHA-256: c2554c5cf1cd9e8e3e7e9ca4f8566865d26b43a1f5d5f70cc4ea81e4431ad0b2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous external URIs, many pointing to compromised CMS uploads or disposable hosting, suggest an attempt to redirect the user to malicious content or download further payloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://cructi.ru/uplcv?utm_term=polymorphism+in+c%2B%2B+notes+pdf PDF link annotation
    • https://idd.no/ckfinder/userfiles/files/supekamese.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/531jsqlthodj634qdj8v7re69g/96562171494.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4b2295f3---9636230300.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/83364464779.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/21bc4786d4444be12800aadc7af61390/70952092867.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/39443093224.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/25116588949.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/difekoxajisudabukesor.pdfIn PDF document text
    • https://zionapostolicministries.org/uploads/file/lujiposoziw.pdfIn PDF document text
    • http://aatmicscience.org/asuserfiles/file/gakalebovifarojuvawipam.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/72137867416.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/ratofegunovefegesugekoxon.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81514982a1---6214259726.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071ecd294233---kakitem.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706827ee185---72858418609.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/3kkv5nn9n5dak47hqffl65rv2a/69473505417.pdfIn PDF document text
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/43988151209.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e03e8a90bc---79823659800.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160a80a765a6cb---25928588855.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161162061e48c6---56624737709.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608342ab77cb5---sevuvomuvuxejamikawigum.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/3c04c6af798c7ab390b410927d231eb9/13060389065.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/25087140435.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/tppagtb3q37e4ov7akbg5qnnv7/zunuvivit.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/34760867698.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/folurelodimukelos.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_off0000bb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A5 10840 bytes
SHA-256: 29c0d82ef99b500a5354656a46443fc970dd3c34f950c8cab3c2a851288020e5
font_02_sfnt_off0000ec78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC78 15528 bytes
SHA-256: a3d93414f8840e1b8dcbbd36dc0648a00f4e69e213faaa578decfd4e6e8ea001

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