Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb57ef22732df8c2…

MALICIOUS

PDF

91.0 KB Created: 2021-06-28 23:04:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8b5a71b54ff18898af310f729c4e482c SHA-1: 7e8d07d3fb4d8839c6283388ee524199f95bb211 SHA-256: fb57ef22732df8c231a8a0151d0714bb1d8ab3add78b2e4813ebce0d853f3728
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://medvor.ru/uplcv?utm_term=day+lilies+dogs PDF link annotation
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aece9ea836---56362669752.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/40706343730.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/a823c63ffafbbdf433fe085f3f27e640/98956188322.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/a0851689cc5822ee164f98a2152a45dd/6804990297.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f121b3132d---kosogumafewotonogabebula.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd53c673a1---29434978393.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/71652962530.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/nunipidokunagi.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd47ef608---80457305315.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160811de6b7073---fudojenuwak.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210611_38A7EF254166571B.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/22260808800.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7f4774b82---98585835107.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099da50e55dd---39308071257.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/84558546871.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/serebonipaxemopajozi.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/zulonesibus.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/e742c14a39d0cae5b99a586080cc1f06/16951758556.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/69817093548.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078dc2ab73ff---42087651325.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_off00010420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10420 16948 bytes
SHA-256: 0bab31583ace1274339a9d10990ecbbc4789e30e4d26dc5f2fd871a791836562
font_01_sfnt_off0001304e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1304E 10236 bytes
SHA-256: 92d6f4e2c57785b5c268ae91a2cdb23bc5b5288b6e68d48432b65df96b8bc2f5
font_02_sfnt_off0001472b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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