Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1dea0d52f0ca314…

MALICIOUS

PDF

86.2 KB Created: 2021-09-05 16:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 78097636fbc98bd251e7eca869185543 SHA-1: 0834f2f65fb48fd23fdd3209c65a5c42cda6e1a9 SHA-256: a1dea0d52f0ca314a40a3c9f37d499e35f24a226efeb626422b3825b314e733b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of compromised CMS upload links suggests an attempt to leverage legitimate but compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://ludifrance.fr/userfiles/file/49808412747.pdf In PDF document text
    • http://nextgenship.net/upload/file/20210620162420243784.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/gabidafoja.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/83565191280.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/16032323267.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/5ecf55b9a4f39bf256a596830e38310f/lilemelugazuxuguna.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/ganudom.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8235c2baa---8209609174.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/xirum.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16074d2c64f32a---sewakalexar.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/69910453641.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0e0ee72798a8fc7665615e3043306ecc/85436998633.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b4afcc5cd---15986388927.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/luxerononev.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a4de3c193---bilisapu.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/40422106824.pdfIn PDF document text
    • https://negaratoto.com/contents//files/dadama.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/81974825931.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690deb42fe---vosiwarolava.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/degoferuviwaz.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/70600751805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=hobbes+state+of+nature+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_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 20032 bytes
SHA-256: 62500cc1142234413d974de704c0bdc95e9160489eb220d0f823a008d026aaea
font_01_sfnt_off00011b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B38 10584 bytes
SHA-256: 1b669b4bafc6e51ad99dfb3f7eb51df51616550896c1152ac2477d04f6a94839
font_02_sfnt_off00013348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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