Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4d9f48996d91b4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 16:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0e9cc2fee31793ca62fb79ccfdf91603 SHA-1: 0b53d88f13f5371bdd70fed32ae05f0661babd9e SHA-256: ae4d9f48996d91b4d94686b488df6a77ea9462aa14a57f8eee744a9f9f505e5a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong attempt to direct users to potentially harmful content. While no scripts were explicitly extracted, the structure and heuristics suggest the PDF is designed to exploit user trust and lead them to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2f4atisnkgvdputsmtv4vr9fc3/kapexunalewipugewe.pdf In PDF document text
    • http://provia-events.de/pics/fotos/1/file/tiwawerivozuxativef.pdfIn PDF document text
    • http://axwelindia.com/uploads/jujidogerajuluvedivomun.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/wixetusawubevu.pdfIn PDF document text
    • http://abaj.cz/UserFiles/File/15331926507.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/80197271274.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ebdb3fe9b---40165792783.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0508525c0c---25504215055.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/92296632532.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/lufejijavasakuwobo.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65d126d8e---64857297076.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/9804792616.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608c82e507128---zelefaluwufebive.pdfIn PDF document text
    • http://onlineexpert.in/userfiles/file/zavovenedokutenodosex.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210813042023_w1nap2.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611982abd1cec---lijuli.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/92324275878.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/7e1a32b87578cf0b375f67a97a6e2727/negepeduriboxo.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/69726756235.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/dc28741746927f52dc3a197dfd3ebc72/88607526553.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062821134970554.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/4a6091ab712e254e105582844a967aef/46696058828.pdfIn PDF document text
    • https://cristalensi.com/public/File/11314658605.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/daf36e5be7fffa99bcb9b0c22c9c73f5/84881539202.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=oxford+handbook+maxillofacial+surgery+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_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16148 bytes
SHA-256: 2497c2db8f7ecd91c59e5c596ee2edb0973ee94db8abc1dfec79b6a9833c4656
font_01_sfnt_off0000f7ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CE 11540 bytes
SHA-256: 66f3782b31830caaa8d425ba218f2729803f4ab3eb3bf1b485ed10070d4b124d
font_02_sfnt_off00011290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11290 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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