Malicious PDF — malware analysis report

Static analysis result for SHA-256 893dfd549ba4ae87…

MALICIOUS

PDF

86.7 KB Created: 2021-09-08 07:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9e69dd91fadbee1ec9cc112a2c54b089 SHA-1: be2c86f680ada40ba64b761381476358edc714f6 SHA-256: 893dfd549ba4ae8790c697060d835bee666cbed77ab817a42f048696af8cd58a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on potentially compromised or disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of numerous URLs, including those pointing to compromised CMS uploads, supports the attack pattern of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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=stone+masonry+and+stone+joints+pdf PDF link annotation
    • http://copingconversations.com/userfiles/file/tiwuvomaso.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16089b386be316---45467875599.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/345004476.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/81425365943.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/cbcbf684c3e241c9a46a56d2fc9998d3/zozogixegaruzigukuvuponu.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/3793313034.pdfIn PDF document text
    • http://snotlicker.com/clients/10243/File/timesanawabamif.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/mupaduxid.pdfIn PDF document text
    • http://esangsok.com/upfile/files/xabiles.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/8793914233.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ad516bab858---wagag.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/boxokexesonunubugusiduv.pdfIn PDF document text
    • https://wmu24.ru/media/file/zojinusiribewuwofa.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782747a082b---damimuvetekuzukoli.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/patinipiluv.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/dl3lpv2o52kab1jqfo354b3ln2/tunexose.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/29201109498.pdfIn PDF document text
    • https://afayl.com/userfiles/file/67312494029.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/uoi1sitrgg8ok4fvo394pdqq00/14712133019.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/vaxuveviwifidurub.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a65543c91---xolawosoludenexigofenesu.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6fmrapkftohfs75gau7m3tj8be/pidadugavifov.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608843fddec6e---45116364722.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/g2sdt858cau9blsavorgklvj2r/movimexilu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/3587de58ab8584b6703e156ecc705090/78690918269.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608b8d12e466d---ledupinefowakinar.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_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 20604 bytes
SHA-256: b1b2a45aafc950664237c6512fad3d9d42dfd1a78245d19be20850cdfdd95cf8
font_01_sfnt_off00011b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4E 10932 bytes
SHA-256: 8e4d0879717f841be5f7b74cd2c67c607ca1955c40403b057843527b5c3d9451
font_02_sfnt_off0001349c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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