Malicious PDF — malware analysis report

Static analysis result for SHA-256 827453bb1a480ee3…

MALICIOUS

PDF

89.4 KB Created: 2021-07-13 10:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 831318e1fb51562ab84eeb5e5a2af9bb SHA-1: 8c8ed25571fe00cb13e5a2bf05d98e209c63a2a6 SHA-256: 827453bb1a480ee3e59650c39e7ecc5d462414a0d51fccb36065e4d33e83a4e5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, indicating an attempt to redirect users to malicious content. The ML classifier also returned a high confidence score for maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7147e2deb---kimajo.pdf In PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/22551750996.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/28948194135.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da600da52ff---36065169085.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/2989475911.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/kimowib.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/87280b1dcd8762e80eb9560c555aa4d6/bomewebodorator.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/rigovumabaw.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/mavugubutedeziw.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/7455fb742385f50e79b40d815e850d4e/91832814889.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160df4bf8324a7---55596841698.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/40b3750fb1eaf05583000443968a75ff/54161951750.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/55158142398.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c71add1aa8---2393101086.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/66280804703.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/kewaxefebuvima.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/muxorijedi.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/69232825905.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/2kb0cqh5akcm7239jdiqn10c6j/kisogosanasa.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/24a19ab15b9ba7c5dc9592b14689b40b/zisetazex.pdfIn PDF document text
    • http://wearebryants.com/clients/3/3b/3bb22ab34fb8fe691aabc4d0498f9caa/File/bipijemiw.pdfIn PDF document text
    • https://anfauglir.com/images/file/73601880206.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/2040bb294539c5bf02916f5cb072cac1/tekowixitoko.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/45203180516.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=usmle+step+1+example+questionsPDF 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_off0000f884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001109b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109B 10720 bytes
SHA-256: b073b00bfccb46f499aff26d176bc760e2d6ddf501f68194e646c74361675954
font_02_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 17940 bytes
SHA-256: 2acd08c77db61a0f37a049204eb85396bca9149f71e435b8d169805fb1844ab0

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