Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8dbef949940aad…

MALICIOUS

PDF

91.1 KB Created: 2021-09-08 07:34:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1aa7dc49a1495613397d3ca4cc20adab SHA-1: 9e4d7e4d4f63aac7023739ab62b7a04f2dff8396 SHA-256: ce8dbef949940aadc1a916aae7879003641272e57ab74843b3e16be5a6e90826
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains a link farm with numerous URLs pointing to compromised websites, likely intended to host or redirect to malicious payloads. The presence of a 'download button' heuristic further suggests a lure to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=ielts+reading+strategies+for+the+ielts+test+pdf+download PDF link annotation
    • http://solac.nl/app/webroot/files/userfiles/files/levaf.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/11290450122.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/99a9141513c07e20c3559e23baffc936/34923091612.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/173568315.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed968fbb5ca---24802055881.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/zabezavixev.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/52461537952.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/35290565005.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/903fb263583a7823acf8d8372b86327c/vuzulovezedada.pdfIn PDF document text
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610f18e772---mujuwalilisesemo.pdfIn PDF document text
    • http://d4smontreal.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/38291193024.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210718_208EAE6B2F057514.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/53289715087.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073318eb3c34---76121469424.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/52450498217.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/dafasemulebutidox.pdfIn PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/35691839803.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608458d565d23---30644317365.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/zotusesiwibozisujup.pdfIn PDF document text
    • https://kominove-centrum.cz/media/files/file/nufuxuvinozatenajexoxuko.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16073f9d741987---nirugaguvolidizudikux.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/9h12co0m0pthj1svu10n3ghs31/vasobobupa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 22120 bytes
SHA-256: 61b662f5e1492af80ebd3610f39bfd7c4f5982f86b291d62c5a107ff021e347a
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 10816 bytes
SHA-256: 34a51e170070315ce94859c7939b88c77b1273d44f9ae6267b74745f582109b4
font_03_sfnt_off00014806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14806 16252 bytes
SHA-256: 1b8db45e7ce78afa1a930e4adc7d2cc3d98092d808e7cdf3049bd86f2cb86cbf

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