Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c2c57ab6a0aa23…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 12:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 54eb7db5ebd403f3939ec26e8643b772 SHA-1: 84ab40e65de90ff390e899b81d1fa25916ac73db SHA-256: 40c2c57ab6a0aa234f867a50f8da644e7dc49c75ba812881169d63b72af37307
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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.
  • 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://niboparis.com/upload/fckeditor/files/86460894598.pdf In PDF document text
    • http://edu-family72.ru/content/images/uploads/file/xinerijiz.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d53cd82c6df---felulu.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/k0nhne4og7rtngq8rnecbdegiv/zafasifivokub.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108dbddae1bc---gebaxekow.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/linafad.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/barisisivad.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/juepm0c7qs6qj9u1uv41qc89rg/venikowekibofix.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb17c0f03e---doxelo.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/64660990542.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/6661428245.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608058fe89279---lurigukijufi.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/50266279847.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/92298422713.pdfIn PDF document text
    • http://vina2002.com/uploads/files/rupugiresuxekozedu.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e6506b43d7e0183a48bf29c6fef91da2/noxiporadukimedupexuri.pdfIn PDF document text
    • http://kodemari.info/data/files/vuwoxiradi.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/47893352788.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/wezufexibuno.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/k3rok23gati6unpmrld8n94k61/debewovofalevipeleb.pdfIn PDF document text
    • http://cmtsport.com/pliki/53758844860.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4fa08bcf1---13817105769.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/4u3k156o4jltteptq2uee1voi7/noxuvudabaxaguk.pdfIn PDF document text
    • http://grasslandtj.com/upload/files/39725795529.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=play+for+java+pdfPDF 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_off0000db05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB05 10208 bytes
SHA-256: 1f5d49aec745cee3a9f16ea446424cbcc5579b5b11a5cb9cf5056a3b91cfe69c
font_01_sfnt_off0000f20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20E 18068 bytes
SHA-256: b2761310fba3491b861941c271493ec1e00196e97d7a679ddf243a4bd5d5d972
font_02_sfnt_off000120e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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