Malicious PDF — malware analysis report

Static analysis result for SHA-256 16eec217c477c09e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-07 23:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f0c455094f874f62b1a3cd51110ecef3 SHA-1: d12f136f798f8c6ef97e41123510417942cf16e2 SHA-256: 16eec217c477c09e36eaea81004b1644e4a07ead8c9bd423d672ac16d744d5b7
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, indicating a high likelihood of malicious intent. Heuristics reveal it contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript, though not fully analyzed, likely contributes to the malicious functionality by facilitating the redirection or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tecnibat.net/uploads/archivos/8865719635.pdf In PDF document text
    • https://ivanda-commerce.hr/userfiles/file/nugedex.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c0759bf0d9c---95353100493.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/86666443998.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/6940b697a01395f1357087e7e95b0e84/pepoxub.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/c80ee2977541d20fe15709772379e1c5/povomonezumowarepufa.pdfIn PDF document text
    • http://thegioivaigiasi.com/Images_upload/files/sogopujowak.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160850fa0a7f80---83374867029.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7dcfb74720---vofekerowipixitedetenewa.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c632f793f1---zobamatib.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/75ltoatku0mav56uov3j932as3/neriguzerupozon.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6af33e18b---xitegebagorimazuled.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215132133418176.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/pipejojawakinur.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/15484341243.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/noriwagusabukotumot.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/631455608b46030f20d88382194ac345/67666932064.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/xabikilow.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/vamapulekapetipozudaxu.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/werofopadaf.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820601ce81f---dumoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mitosis+simple+definitionPDF 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_off0000facd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACD 17016 bytes
SHA-256: 1809d8575d9d86f225f8ac25629af5941a9baa190167d1ce0b71fed6791ae6d2
font_01_sfnt_off0001274a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274A 10392 bytes
SHA-256: 06b47ee68556c6c2c4ee26006bd7ddd2aba57129c253c428a481959633671e59
font_02_sfnt_off00013ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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