Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacf823858fd30c1…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 18:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d85f7513cb9f6c384d01bc2ceb7d3305 SHA-1: 2d9d54e33e3361dcc2dc354037b91be3352db019 SHA-256: dacf823858fd30c177b36d15a1653b477337d69597ba004fe4f05a4bac2919e4
156 Risk Score

Malware Insights

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

This PDF file contains a link farm, with numerous embedded URLs pointing to various domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector appears to be social engineering via the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://vestmorecapital.com/images/epost/rutasajegofewibe.pdf In PDF document text
    • https://tahubunting1.com/contents//files/jenakerujutoguba.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3462a39704---befivorapuxumazoruzok.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zerisuvowunugi.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202105300048260561.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/24995418745.pdfIn PDF document text
    • http://sanga.asia/userData/board/file/35948246155.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/guwifapewulivoru.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607333d2879d4---bivitemoxoxufasuroz.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/94035662253.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/66164448221.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/6130914428.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b56d6a5c93a---39843996114.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/2514585557.pdfIn PDF document text
    • http://turatabor.hu/media/59564580753.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/96630302965.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xasujetowovatijuxefenupug.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99fda015e1---72713432986.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/54497379864.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p8ku4a2srhtko8tcev9mmg3d87/remujujorileluxi.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086873989f69---38403211207.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/ruluguridekapamulupalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=toda+la+armadura+de+dios+pdfPDF 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_off0000eac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D9 10520 bytes
SHA-256: d6d3b741fd3927873f34a87eb86cc26673a5a4296ecfbed9a00ccba4d872e32d
font_02_sfnt_off00011abb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABB 19784 bytes
SHA-256: 16595b373f47685caa69f648efb2d63a7d73d8bcaaa43940057256312184567c

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