Malicious PDF — malware analysis report

Static analysis result for SHA-256 2524b46e57f516c2…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 05:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb15ea72c6f2d4bdfc97cf94de1563de SHA-1: 6aeb92b2542d7090e6bfe9fb2caedd0622eec3f2 SHA-256: 2524b46e57f516c24f41f5a2ea973e573a7fbb47f619d02e55edd45544a0df41
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=roger+waters+the+wall+1990 PDF link annotation
    • http://hzbmsj.com/images/upload/File/roriwudewalaxizadoterezi.pdfIn PDF document text
    • http://htwy.com/upload/file/27363731636.pdfIn PDF document text
    • http://poney-club-romilly-aigre28.fr/userfiles/file/22014446387.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb7c6a812c---bavojibevisifupibaj.pdfIn PDF document text
    • https://forumsevens.com/images/file/95267825717.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/kisowibupi.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///39296175146.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/03e11cadf18df3333eae5378d6198136/32730631218.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///duravaj.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/bujupufakibunivudizem.pdfIn PDF document text
    • http://rsti.biz/files/fck/file/nugozenifaledogirivufu.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/59454115426.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613678af6d699---20492217378.pdfIn PDF document text
    • http://dinobajka.pl/Upload/file/xewoduwet.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/88617428908.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/84757235854.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/boputevuputofuj.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/84688044863.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/37407786891.pdfIn PDF document text
    • https://decisionstogo.com/fck_image/file/78104875738.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/jelaregawopaxapelaludeti.pdfIn PDF document text
    • http://peak-experience-japan.com/images/blog/file/88246165000.pdfIn PDF document text
    • http://otohyundaidanang.com/uploads/image/files/matikumatakubalokujaraf.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/muzemifaf.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_off0000d138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD138 18036 bytes
SHA-256: 4747eb3a83b2d11a680741dc40412ffc510add9286b3eec0f002a1081fe32c01
font_01_sfnt_off0000ffd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD2 10664 bytes
SHA-256: ba65a335da194c3bafb9e780ccfcf9a3457317a8826ac8e478bfb6ef773f5d58
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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