Malicious PDF — malware analysis report

Static analysis result for SHA-256 64eae28aa9102b22…

MALICIOUS

PDF

113.3 KB Created: 2021-09-07 13:37:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 159e3e67130289d199e38e702837452f SHA-1: d33e3763e215796334510f3f8c63c48c152f8f2c SHA-256: 64eae28aa9102b224a4b1b206c84ab40e36d0444e100cab08c28871dee90809e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous URLs pointing to various websites, many of which appear to be compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted as potentially compromised, with duplicate object bodies.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • 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.
  • 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://catamma.ru/uplcv?utm_term=norma+oficial+mexicana+del+expediente+clinico+2019+pdf PDF link annotation
    • http://dentish.ru/ckfinder/userfiles/files/24862782696.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/1a5a753edb2ea0f7239c3da482c1fcac/82380089250.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609c424d25f09---71482337519.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1baf69d6a8---pawovod.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/dovazasodaborijaf.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/nibiwegori.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/16579672403.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/tomemufizilulosorevazipa.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/tuwijezorojuzegejitekoxu.pdfIn PDF document text
    • http://www.smartlandgroup.com//ckfinder/userfiles/files/66064684387.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/83114896259.pdfIn PDF document text
    • http://svx.su/ffile/file/10386696565.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/61720883526.pdfIn PDF document text
    • http://laduses.nl/image/file/wukujogemosugoji.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/wiwoteba.pdfIn PDF document text
    • http://huntland.hu/upload/file/niruputarogewekuwekava.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///sawisuwininogamuxid.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210825194926602.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/10992420730.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/84f57e01f10623b1ef54a1e74e7c3c3b/34483284774.pdfIn PDF document text
    • https://wita.lt/images/files/85602019765.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84114a66db---22176045732.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e331145e98---13985298528.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/fitemapat.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_off00015088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001689a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1689A 19476 bytes
SHA-256: 8d573a73b5c35f367f3439cba4513d4c347bc1df1558b084706772633e05721c
font_02_sfnt_off00019ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19AB9 11152 bytes
SHA-256: 20bcc68b68e5f2c6c96e2ad8efcbbcf312e031e8f970a5367b93ff1ebeaa7c3b

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