Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab59011e51908e6e…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 20:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 332816831a13ae7148e1cd573109fd24 SHA-1: f2c3ea5210b8a770d952a9aa88965f513d4a3f50 SHA-256: ab59011e51908e6e993a9426209709954869898cdc09455bace8c53934dcb428
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm heuristic indicates a strong likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://columb-sklep.pl/userfiles/file/vivejuxegixojetiguteku.pdf In PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/3e162d5549bc67a607c5ad91084113a0/76158961735.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9c7d8853b---tiroxajuvuwejonamopa.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/98294994705.pdfIn PDF document text
    • http://someteme.com/archivos/_20210909132728.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/govivuxumiziropona.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/1202270143.pdfIn PDF document text
    • https://susta.vn/userfiles/file/82170282367.pdfIn PDF document text
    • http://labsshop.com/d/files/4988843449.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/13514152767.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/dizolijodafijajefejux.pdfIn PDF document text
    • http://parfumland.sk/upl/15357716280.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/68096548527.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/nenujobafizigu.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/pekunote.pdfIn PDF document text
    • https://classykitchen.pl/web/uploads/files/5548338394.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090522453273499.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/gokunosowebanedeko.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da27ab1b16---jusijazositoposizuvaja.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/manajenegidodajiremiw.pdfIn PDF document text
    • http://inbiosa.eu/static/cfiles/files/jojebujomujixawom.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/wuzeve.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/58945494470.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161344d520a361---30826814713.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=vochi+pro+apkPDF link annotation
    • 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_off0000be23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE23 9984 bytes
SHA-256: 0c7d3269ba5dcfc97405cba54c984e5b78a7fc6f39c3c195720afe021a6d6fd7
font_01_sfnt_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 15472 bytes
SHA-256: 1ab6ffa9a726ca60bdfb7e1b17d5ba5a016afa2f1a355af415d0d012c109da92
font_02_sfnt_off0000fb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1