Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9538883b215f40…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 03:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c98ba575bcb4928f6d83812dbdb52ad8 SHA-1: 3a4e57e47c979c622325168015c6384d5fe16a9c SHA-256: ed9538883b215f405fdac7187e2d9373ff46e03f77ab0df45fc0c8890eadf2fd
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://irlanc.ru/uplcv?utm_term=zee18+iptv+apk+download PDF link annotation
    • https://gtselect.fr/ckfinder/userfiles/files/nulumuzibezut.pdfIn PDF document text
    • https://hkpefa.org/editor_upload/file/suzekito.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/46557154197.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/81570475202.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/purezisadafuxovor.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbc4d50e6---tomiboj.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/sowuxi.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/64429933405.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/45599216042.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614413c664a15---wapab.pdfIn PDF document text
    • http://ilkjv.com/Images/Media/files/nijegigogixupimo.pdfIn PDF document text
    • http://julianina.de/upload/file/zozibakapiju.pdfIn PDF document text
    • http://baove24h.org/upload/files/mifunisevowipifigibuvabuz.pdfIn PDF document text
    • http://capitaldanceacademy.com/userfiles/files/larolokus.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/46695571829.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/472526ff97be769ab0219282e152feb5/26905242819.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/11028558730.pdfIn PDF document text
    • http://airfa.it/userfiles/file/lulilezekurumozazama.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/digasedutajilab.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/24881539762.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/lijijudulesivu.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/58387314775.pdfIn PDF document text
    • https://marblobaths.ph/app/webroot/img/files/25522299828.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/jalipi.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_off0000d6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AC 10584 bytes
SHA-256: 2bde762fb25e218bde90296cd1b56ac074ec67ae05d36bd66c9801020f43b894
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 21196 bytes
SHA-256: 9bdc977d1e9dc68c2e5aad7358cadfe7e6bda64f8e55448611f7600cccb3f475
font_02_sfnt_off000126a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1