Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1317237746998f9…

MALICIOUS

PDF

74.1 KB Created: 2021-06-30 17:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a157ca35774b55bef08603927b6c569f SHA-1: c5eb087ef330cf255c8de994d060ad9ed601d168 SHA-256: b1317237746998f9db5b1d670caaa993ed1ebac5e43c991c98091657c88efdcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of these external links and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://synerhu.ru/uplcv?utm_term=moo+tong+liniment PDF link annotation
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fb5f34dcb---63473450933.pdfIn PDF document text
    • http://atek-ent.com/upload/file/20077994339.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/48331016384.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094daf573c25---jexigerogolesafoxowi.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hhmsuthehfiudtbp7avj3gfhis/16652359886.pdfIn PDF document text
    • https://goldenapp.net/file/wuzuwunegovozurukepu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b00c80657c0---bamawibozarovesop.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/voluvazasolu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/22708158806.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/58115180710.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7ce9e24e8c1154810d942e99f174d84c/24722795688.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/1bdf9ea7dc16b78b1da1b8bd62e1ccb7/viximenakabalemakegitego.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/7205f21d068a0b0983ea2ed37c7c9073/42571983892.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160d715de8abcf---97850700155.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/lekuzutuzerudupelosa.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/thlnem0urkafar796mgm83qot4/16582684742.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a6247002a---57955140323.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/srvpuniq8i6addm71gi63h6aeg/656125220.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/aca92c3666f8c1bf16ac15964b86ee70/kagar.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/98053765643.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/50461457628.pdfIn PDF document text
    • https://cakenepal.com/userfiles/file/minadumadefokajorawitu.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/vuxapu.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160716bf6e0af8---wukitutonagurapefeg.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_off0000c281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA93 16464 bytes
SHA-256: c1f4a4adcc9d761afb684990b83e8db547a44a02a09b2c8478c9c0deece84433
font_02_sfnt_off0001054e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054E 10012 bytes
SHA-256: 21feef2d4ca17e202f53bdc7f7391d6c374d75d705d430562c4691439f1a7897

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