Malicious PDF — malware analysis report

Static analysis result for SHA-256 d087aefa96b7e6fc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-02 11:47:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2d87ee496dd1c97a47fda0dc851eb710 SHA-1: 92b2116eedb6123cc807d44e3190542d9f59f031 SHA-256: d087aefa96b7e6fc8e73494fbb6819ee9cde0a24eca317949fce54753d12b920
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://smidgel.ru/uplcv?utm_term=possessive+pronouns+worksheet+1st+grade PDF link annotation
    • http://nelly-design.ru/upload/files/45335154510.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/tegibobip.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3382641d---67604538543.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210524013212.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1611768dde7f6c---51162122634.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d68f1a8ee3---megepod.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c78179ad7---10403544400.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16126f9cf62504---mamekivowukuxemiw.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/35382860933.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/geduretesen.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5f4261405---33272405123.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/l4cjapt8015ruroshlecveu4ni/48359753866.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/bukugizajawujudofujuvuv.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/galutuvonitexurori.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mtbe2aerbebq70eiacphgpctjg/tozawagonawuw.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/4ffee494e2c86c6d739df61841d14fdf/88747301400.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/jirisenefodu.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/25f6c916db08a7875fe106cbd424ef26/77508741871.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/32932312853.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/66113636661.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/824a7fe3afa84f1caccc6604981d4bd2/9712272768.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/69093345299.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/dofupivovijosokulino.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2e3e1597ee4c28d9c7ad0306717b0cb1/77331129790.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/66778363506.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/fidekudiguro.pdfIn PDF document text
    • https://citytrafik.nu/images/file/medufowufopa.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_off0000d273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD273 17224 bytes
SHA-256: cb19926a9c53e1f88f45a3cd571f40e32361c10a403be8c7de9bd62cf33bc93a
font_01_sfnt_off0000feda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEDA 11024 bytes
SHA-256: 31de7ad9f5dc972c23532567f2282343f04c4aaf00128a3917e666c02651e6f2
font_02_sfnt_off00011866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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