Malicious PDF — malware analysis report

Static analysis result for SHA-256 187ddca8573b3958…

MALICIOUS

PDF

87.0 KB Created: 2021-07-22 22:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: bd2d26977b08f5285e9fdf8a477c04d8 SHA-1: d7043a821f5c0f1df6fa8c35683eb7dfa145f2dc SHA-256: 187ddca8573b3958792de54183ffef56af487f42633d26a6d7656797d3907f4f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a link farm pointing to compromised WordPress upload storage and other potentially disposable hosting, suggesting an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number for a deceptive purpose, such as a tech-support scam or callback phishing. No scripts were extracted from this sample, but the overall structure and heuristics point towards a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://itacademyindia.com/ckfinder/userfiles/files/serolopekusolumosefiden.pdf In PDF document text
    • http://rgn2u.com/userfiles/files/69770401283.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4ba597c70---pelas.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/41225135261.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608044f35540e---13561504834.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-6-28/20210628053639730263.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/c5db9667d65adaa573b694195875455a/90509927369.pdfIn PDF document text
    • http://yuha.be/_files/file/debepojen.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/f8e179b0105341b2cae477de94a3549e/sibofitoravazotedav.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/vsd8b1galtkar0hrk1ci3tl7l2/67428080886.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16096ff4d0a2d8---nuvozexesa.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/bezipopupap.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/xikujed.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160946076252db---mejanedoz.pdfIn PDF document text
    • http://accronline.com/userfiles/file/posixirosovakoxisem.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160cb276b471c9---zogazedeluvam.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2cc6b309d---beserolanoku.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a41daf51d0f4278021c8aa846b08b191/72372253786.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/97045827977.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7172ec119---93561131506.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc34b3a6d7---nujutezuzikupejuju.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/98b89fe11386e6152e47213c41d76e5d/57004004464.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/95971134323.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/18709856586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=certified+mobile+rv+servicePDF 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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10608 bytes
SHA-256: b737ce39c1e22388c473650988702b81f0f9f30cd0770603b9fb7fa9c955ab94
font_02_sfnt_off00011f2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2B 17608 bytes
SHA-256: 742f1c093ea36586b0f8af8b64b34e977336671dd878d0b5019443e2057ac980

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