Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5dbac71a7238db0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-22 10:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f09f0e735eb8bd3c6a586d53c00b2f91 SHA-1: b0a2520a5084f6eba7834f8e0559478d9e2cff93 SHA-256: e5dbac71a7238db0e0dbcd239a0c9910141c47d5540a228ef8dd0862a434b74f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://procogs.com/FCKeditor/file/xifamej.pdf In PDF document text
    • http://dhleisure.com/ckupload/files/jajabonusototokup.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/deviretuxafumupu.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/banasebisorufow.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/92718464498.pdfIn PDF document text
    • http://benjapakee.net/UserFiles/File/50611386516.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/56103665786.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kimujes.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/33cbabef0264f0eb3a53c69211d84ede/73487847848.pdfIn PDF document text
    • https://twinscooking.nl/twins/userfiles/file/nejineno.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d734852c08b285c401fd6faea4a409ff/15411324473.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/wiwawunuzezidixogez.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/mukizivapasi.pdfIn PDF document text
    • http://lachina.cn/upload/file/174212229.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/77962744818.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/07521ce4e992ea824f3f663445a00da3/bufulopitigafif.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/zobefepoxibineguru.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/vukunapudalutunemu.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/sosatinodegetunetojepo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/48457733948.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/d1bripqi0nfh5sm4dp2jjnkar6/85304232142.pdfIn PDF document text
    • http://irths.com/upload_files/files/zepozozupuwa.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/wijejevutabokesureperisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=mod+apk+major+mayhemPDF 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_off0000dc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC60 10480 bytes
SHA-256: aa8bf1ae95bacad690fd5409936b842a564a1690fad1543eb13e41ec610c06a6
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 18140 bytes
SHA-256: 972be250d3133d81c6bd393bc44e0dab4a27a3e1b94afb7debe1b0c0e3049c9c
font_02_sfnt_off000123ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1