Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1cdb5320d876342…

MALICIOUS

PDF

80.5 KB Created: 2021-06-28 14:51:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 79ae8aa76d7f79f61521975a4d8b88ff SHA-1: aa723694497b03bef0f74840ba90da72753a1694 SHA-256: b1cdb5320d8763427c6b731d42ee0eeb13a059ad7fe4d1cec67afef7cd05850d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the overall structure and URL distribution indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=ark+server+patch+notes PDF link annotation
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fb8ad611f7b4e23530d61d8cb8b8be5a/13926074475.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86eb57097---wunizakupidago.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7f4cc90e3aa48643619af5ceb6ad74b9/9272067590.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/68201571072.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/dg1ebga8fveh4ejbn7q7enn4r6/wapanewabaketajeromexesi.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b3ba0230f---filikewufefonobowax.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607920e38fb64---41318732311.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9849995f9---35886666212.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a01d0c229e---27909112899.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/4e958e84a69a09781e6ba58a63412c77/2178323298.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/pavegoxur.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mexadosexa.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubadujobiberonususorifow.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/7e6jnas1u49mp76pr1imj3cge1/rovegijuravigudifiwobire.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/qf24d8fbem5be3a9rj0to9k9uj/soxodevuvubuxabiv.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae93bb62ddb---kulitelireji.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/tuxifi.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/dce484f3c348f52ee0d63a9f9f7f2bb9/20314196151.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/46400439506.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099487d5c6c3---31821872890.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/vabatubuxodobo.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/edf2js53e0qus55odsb3m7oe42/34330342870.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c0dc278e4---risomuzovagami.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/fc7d98abe4d3a392a390ffe7f2ca58b2/memalonudawolexu.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/4bvjsd345r2s5r675j048670r5/nawupoxazola.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_off0000dd7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7B 10472 bytes
SHA-256: 709107aeea5b2a6764d131222a82d7b7cb30055873194d1b741bf3271f762d06
font_01_sfnt_off0000f557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF557 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 15056 bytes
SHA-256: effc5b00d18ffd4973592ed840d5ba6b689ac45573b1502cdd9cb1998c79c365

Open this report in the interactive analyzer, or submit your own file for analysis.