Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ddedf908623bd67…

MALICIOUS

PDF

81.0 KB Created: 2021-09-06 05:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 253f1a5af68e3d16cb63ca50adffc6e7 SHA-1: c4638aa2cc9ea45c8dc6253ae2bcb932bd60b234 SHA-256: 1ddedf908623bd6755e61cc46e9867a7d21ed42b769f2b33db38deae827b7510
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://huntic.ru/uplcv?utm_term=year+3+mixed+times+tables+worksheets PDF link annotation
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/56048f5022a6fc247393bbf541de2b4b/vajoxirofu.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f53284b0dc---jepowomebuxifedowavelop.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105111143.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/20ebab504b6333b56c1facc1e5d535a0/lajunozawasab.pdfIn PDF document text
    • http://espressoperfetto.nl/app/webroot/files/userfiles/files/27467860416.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/fanixozubuk.pdfIn PDF document text
    • http://belst.by/upload/file/fiduwefojazukevibodege.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cf09280cf24---folovekutiwesimigemezele.pdfIn PDF document text
    • https://cakkue.com/contents//files/79999715006.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a545296c327---ludemepu.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/23525fb07b4270fda8aceaefb1e4be79/povekoletepobisi.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/56369983282.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/viruvalowavosuforuzebupod.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/9db0190208bac878634c7ffdacc4015b/ropemokuradad.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/f7e6ef3b9d755319b56e8505c052c4d8/42187912817.pdfIn PDF document text
    • http://drive4smilesquebec.com/clients/f/f5/f58105ca183540932673f5bf18e62671/File/buxamerogepavatoruvo.pdfIn PDF document text
    • http://temple.mo/userfiles/file/38463383310.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/18437593918.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3cd163981---wefowigetiwoju.pdfIn PDF document text
    • http://veitali.com/upload/files/vexogerixizigag.pdfIn PDF document text
    • http://vervesimuhub.com/userfiles/file/13955106865.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/7936709881.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c584a72eb5---222256276.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD988 17124 bytes
SHA-256: 0c6a8c6156060351a8486c514a5ad30207e4d8846911ba442f4cff62ad5ec7ed
font_01_sfnt_off0001052b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1052B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D42 10984 bytes
SHA-256: 5de76a8fdd7991772dc5f6f7afe3baa01eab0f69479b2f5d0723df25a82470a3

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