Malicious PDF — malware analysis report

Static analysis result for SHA-256 3417b401a634ca8a…

MALICIOUS

PDF

87.7 KB Created: 2021-09-04 14:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 30f367cf43aa54ae6f8601ea2be51cc6 SHA-1: af2803be2b3a6fcb7bfe7a263a9a37da4568b453 SHA-256: 3417b401a634ca8aa79980f7e95e8e7d96167ad4cbf5f18a94d442bacd650f5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a deliberate effort to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://archism.ru/uplcv?utm_term=hathaspace+air+purifier+manual PDF link annotation
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a90da7f41---jopagenegaruwunimabat.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/torizevibusirepozadufafi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/64879224738.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/f2e7d3fc6f211d7c8be54c5868c6f5d2/dawoxevipesogep.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/45999859579.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/romuxakagitojulenovurax.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/gujipigedu.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/67c1f585b8c78c608a4463bc41407306/69003014303.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/galepeduga.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e20d80a8ba7045fc992d34eacb66aeed/4435659325.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/76503341854.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c9573f9c6f1---99938557375.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f1e849cb199---68557779777.pdfIn PDF document text
    • http://envigest.cz/upload/file/20793698165.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/dewisuremilo.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/velofufosepuliwegixuvikab.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/devudin.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/kjagldhfa9btci8kgobinf71m1/satizowut.pdfIn PDF document text
    • https://dcimx.com/files/42157115488.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cf4378dc1fce71105913da990e12bf5c/mixavapifarakamawemeduwap.pdfIn PDF document text
    • http://midlandhigh65.com/clients/6/68/682e31fde28f8c6bff7ebba57332ef5f/File/69503986003.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/kojizonupevobagotisisakal.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_off0000f09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09D 18368 bytes
SHA-256: 67e5627ae8e6593a2d5629d784b23e1d4caf907a4a1da72bb4933d871f404759
font_01_sfnt_off0001207e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1207E 10716 bytes
SHA-256: 0918a48b41d497de96ba74fc76ad8d240190ac5be40f0194b1f7c696c696b325
font_02_sfnt_off000138e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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