Malicious PDF — malware analysis report

Static analysis result for SHA-256 24d9ff39471ccb58…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 07:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb00032f6824ceeb0b4be82400da4952 SHA-1: 84c0677fa1c04191d31ae394f5c4f7e25bbb7adc SHA-256: 24d9ff39471ccb58028e8c06fd6dda7aa5dab7739b273a9c553137ff318ea308
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links pointing to compromised websites, suggesting an attempt to host malicious content or redirect users to phishing sites. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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 http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d8306f949---zilemakanibaviwutebajez.pdf In PDF document text
    • http://chukgoobok.com/files/fckeditor/file/gojerisimunugiletakuvoseg.pdfIn PDF document text
    • http://seamacros.com/upload/file/jinajumogevapox.pdfIn PDF document text
    • http://clintonseniorhighclassof77.com/clients/e/ec/ec6cde7faca09d53f5ba1fe44cd32e38/File/samulidewexef.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/27f728078995a9cac577a47aad929c69/kenutilifevuvudukibilu.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f297c1e652c---11136567196.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/7e32992c89e1999b9b0dba29d0f903fa/89278966044.pdfIn PDF document text
    • https://yellowstonewildlife.com/fiwiloladoxogem.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/89656611687.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608a77a7ab53f---52856382122.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/2583115165.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/nimom.pdfIn PDF document text
    • https://mahae.hu/files/files/pamiva.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a50c02392cb52f37cf5d1cf655ae8a0e/78101675237.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/78aa6c8dfde82a55ccbae357713448b8/90385685280.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/sugufebizamewewepupenap.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/mabili.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/2440950629.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4f088f076---lazekufuna.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608363a2c065f---16146887050.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/vakufisusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=percent+composition+problems+worksheet+with+answersPDF link annotation
    • 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_off0000c70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70D 17332 bytes
SHA-256: bf26270a08c4c030084fb81584e8ae48cc7df34fa4a6886abe9595512c48a221
font_01_sfnt_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 10956 bytes
SHA-256: e47cbf3c6a6f3420e1a7c857f673243031f7c44118965806c44d50852c4ab348
font_02_sfnt_off00010d09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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