Malicious PDF — malware analysis report

Static analysis result for SHA-256 5eceab662767f559…

MALICIOUS

PDF

73.6 KB Created: 2021-09-18 01:56:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6b539882e586b0f3abd7b6b38106c5e9 SHA-1: f718df58715355bd2fa41d2d5a318a3c8ce5208e SHA-256: 5eceab662767f55932163a75ea79f20c52d6b638f2b719c863961c4121544faa
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 and an ML classifier indicating a high probability of maliciousness. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=kiss+asian+drama+app+apk PDF link annotation
    • http://locke-3c.tw/uploads/files/202109050851535502.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee7102e89a---tujudolefadujilufajexeb.pdfIn PDF document text
    • http://ytlcases.com/userfiles/file/76193743038.pdfIn PDF document text
    • https://citrasas.com/ckfinder/userfiles/files/28423235778.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/mowegigafutokel.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16132bea6cf4f1---32489675602.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/zogemikivugokowaxavunotaf.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea79d6495---98378232628.pdfIn PDF document text
    • http://e-sportis.com/images/upload/bixixatubu.pdfIn PDF document text
    • http://proart.by/media/file/tepuxadujupimuro.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/fivifux.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/28094ab9f4ff92185af0ee1a994c41d3/11823725426.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/23631977744.pdfIn PDF document text
    • https://trongtrucsolution.com/uploads/files/menamowolewexejilejakada.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613998258ca88---zokepumomosa.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed91e74bec---54072283580.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/84541234171.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139349aabd08---66487660259.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/34649601168.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/12887333814.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb472dd012---benilumulivuvolezuguruna.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/bada8725f50f52b190814ab6aab4f50c/nituwenidoburakew.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161450c4419f51---dovedi.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_off0000c18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18D 10240 bytes
SHA-256: b0ebe5737a63db07d3de2b8cc9ef4885297f36dd6ec842ef087b9960018e33d0
font_01_sfnt_off0000d869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD869 15816 bytes
SHA-256: 0d87fe9d1397117f1d0470384fb964f1a6581baed46ab646911d64ed9268aee2
font_02_sfnt_off000100b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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