Malicious PDF — malware analysis report

Static analysis result for SHA-256 280bcb9c876ff371…

MALICIOUS

PDF

72.6 KB Created: 2021-09-26 04:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 56e52cf24794c0cc7b501f34555605e0 SHA-1: f39885b14074d5147868241e301b866fa699456e SHA-256: 280bcb9c876ff371595f17c52d9e8d9703b196d9a86d26c9e73915e9ba04d83c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate it functions as a link farm, directing users to potentially compromised WordPress upload directories and other disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://inwebjor.ru/uplcv?utm_term=gazi+tv+hd+live PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d504bae3c5---datexuweka.pdfIn PDF document text
    • http://hanifeugur.com/image/files/84490676892.pdfIn PDF document text
    • http://askaudit.ru/price/gisalojiwomibavagoru.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/77551739481.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/kozazozuwedu.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/17225889205.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/fumimer.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/20688636020.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478e1517860---8890149666.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa9925904---mejusajovanefikelu.pdfIn PDF document text
    • https://netlandschool.cl/files/faxizupitobutejorogimuvi.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/99197156110.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/riwus.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/82575922969.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140272e12c5a---1694709003.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/vemugefibi.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/birazibovejojevopusozij.pdfIn PDF document text
    • https://digireg.nu/upload/jixenakilud.pdfIn PDF document text
    • http://yjccnc.com/upload/files/fakufadan.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/57245893572.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-13/20210913033002502631.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/61298657882.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/sevirujidejexogijobob.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/87f879c8e828b21fb89a4b913aee2ad9/54274512430.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/soxomotesadini.pdfIn PDF document text
    • http://galaxyjewel.cn/uploadfile/files/79701263521.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_off0000b516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB516 18556 bytes
SHA-256: f497a5a03c6ed8e6346fa25d1a8fa7be51991710c99e903727c3260fcef26f32
font_01_sfnt_off0000e4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD08 10020 bytes
SHA-256: 93651e754aae358bedd29505baf04a2ee030a47101a489c11bf0f63e483052cf

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