Malicious PDF — malware analysis report

Static analysis result for SHA-256 754506706b41663d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-08 10:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 55275e44ed8a1ac73d31154fc74eb011 SHA-1: ff371d4caa57f1655b80af70bdc8de9ab2f1cc28 SHA-256: 754506706b41663d05c5c78372d636bb5d5d5696261f6dacdc1e59ec3b72b4de
156 Risk Score

Malware Insights

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

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 hosted on compromised WordPress sites or disposable domains, suggesting it functions as a link farm. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=reported+speech+changes+chart+pdf PDF link annotation
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084b02e92b12---viradof.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/mawarixaxogakukexalotaras.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/jinepominusizusukalugos.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/33342478771.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/28853103103.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ad529c2fc---47905821331.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/17958024486.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f9a1239fce275451c0f66c51271ff95d/jogapuneviwujekujivedo.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/64648601044.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a534e2c2---delupexubisirakonugexaj.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a75eb7bcac---wukanizole.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/45683034585.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/0a16442500bf667e4c5b9c910bd5e1a4/8115518926.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/jobowuw.pdfIn PDF document text
    • http://merwepizza.com/upload/file/84919283833.pdfIn PDF document text
    • http://esistore.be/userfiles/file/99230096342.pdfIn PDF document text
    • http://8njl.com/userfiles/files/41855803007.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/e164c7444e6e78cbfd4460de16e27c5c/lujatanoxonuke.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/20285296209.pdfIn PDF document text
    • http://meta-min.com/files/zuxopibedewemejevajetaw.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d7a714e8f---fudidodonowuzizejam.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/59743652156.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b76ed475e1---95743919863.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/rejedimezurimi.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_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 17824 bytes
SHA-256: ac23572bbb39359e223b7c49f41f8e273ba72344d3c3bbbf3f6c653256773077
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 10808 bytes
SHA-256: 963b27e31d7e460e3a2f565bc9300ef8e1392eed098c6c190f277f65845ac8fc

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