Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff5e0af08d1c9e6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 21:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: faad4fa5831c9a0b4012f0e1ac415882 SHA-1: 6d250abbefa9b6c9495a9864eb4da6f85780306d SHA-256: aff5e0af08d1c9e6a0d53a6457835cda71af95dff1ed9284f87c74d6fa13a641
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 ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of these URLs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://coretry.ru/uplcv?utm_term=how+to+use+ha+tunnel+plus+app PDF link annotation
    • http://thegioichuyendong.info/app/webroot/upload/files/37369781061.pdfIn PDF document text
    • http://vizesblokk.hu/files/file/68826774859.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16140380df1658---36546080875.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/bokonodisilazetabujofepe.pdfIn PDF document text
    • http://mfo-fond.ru/ckeditor/ckfinder/userfiles/Images/files/jaroxedi.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/86188989287.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab0eb3156---38854713104.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/23500967296.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/fulatebevewumas.pdfIn PDF document text
    • http://wine-paraphernalia.com/files/winep/_repo/file/39714159408.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/81161435726.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/81191646032.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/68462226380.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/fudeponasalavilika.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6b0815f62---57619489668.pdfIn PDF document text
    • http://candleelectricals.com/uploaded_files/userfiles/files/zabigowuja.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/vatenefu.pdfIn PDF document text
    • http://surveycook.com/upload/tmp/202109/file/17744774412.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/pokid.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/senikaz.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/9060209662.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/xabalojalowoli.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/49354560536.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/a501ee974ab4475c6903a77198d9c96f/doxigamenozatuzabisoxo.pdfIn PDF document text
    • http://huarui-bio.com/upload/files/74063155088.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/66107181019.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_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF00 10336 bytes
SHA-256: 89049538b64bb7c40230b4cf0445039e4ff72eab845cbcec7575ec405a40f38e
font_02_sfnt_off0000f653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF653 17020 bytes
SHA-256: 8689427dda69df66f5e125636bce33c3382b0b2774bb2e9204267077d38f07a3

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