Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48a7e4dd2702312…

MALICIOUS

PDF

80.0 KB Created: 2021-09-19 20:06:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fcac57ea521f9f86bbf8223c80775e99 SHA-1: 30150adb606703017c433759ff2faefc33ebe6c2 SHA-256: d48a7e4dd270231273f4a35f27a1f12c4c5d8f8d8177479c845e940afbd793d7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The presence of JavaScript suggests an attempt to execute code or further exploit the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pushgroup.lv/userfiles/files/gebifelixe.pdf In PDF document text
    • http://sromedical.com/file_media/file_image/file/jiwozotox.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/95246598967.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/87834454184.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/80599484232.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/121441585.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/16c04h6aep3v6ih5unupcdarjp/38548808880.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7d72c25a9---zibivevap.pdfIn PDF document text
    • http://synphabase.ch/upload/file/6781191957.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/sonelakurokumezegap.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/sopigekurobifun.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/fokebigisuvevudidufufefi.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210908061007.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/sopitugawovamep.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109041530457587.pdfIn PDF document text
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/lovevuxufuva.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/sexuxore.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/josexuxozesebulonisi.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/36494632499.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/8ede08a0aad08d1183f68f4605283d82/jatakiw.pdfIn PDF document text
    • https://www.bnbtravels.com/ckfinder/userfiles/files/31379391593.pdfIn PDF document text
    • http://plncse.hu/php_data/file/miwolizofexopaxibilixav.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/nuxiso.pdfIn PDF document text
    • https://citytrafik.nu/images/file/79511758686.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/vofojomefete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=customizable+widgets+androidPDF 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_off0000d017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 11008 bytes
SHA-256: e95dbbd32644a1ba85656a75ace238ef9b8fef9f251be924d458524b117f5ec7
font_02_sfnt_off000101aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AA 18580 bytes
SHA-256: dcb9f30beffa2b1eabd7300bc0c96c0bc638ae8c22d58d3a702b7652b130351d

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