Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8aec8585361d82d…

MALICIOUS

PDF

79.6 KB Created: 2021-09-03 17:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c3a34e5304dfe258ceb8ee214c187165 SHA-1: 787d6ea902768520b8de7f7b64ca5dcda3872984 SHA-256: d8aec8585361d82dc78bd35e74c638398f39b3a6c4c81ae576fb5421ee28155c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, it features a link farm pointing to compromised WordPress upload storage and other external URLs, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 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://perfect-gallery.com/userfiles/file/75133630891.pdf In PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ca84804653e63151f56cd12b4cdbc8ab/24580816158.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/zodebapudigesilokikaf.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d9002507b---wufupo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccacf90029---jubutemorigiz.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dufasisaruxuxazizopuf.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/melax.pdfIn PDF document text
    • http://adimhukuk.com/resimler/files/gupejazilutatodisaridupus.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609a3327da27d---92505467805.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/rozumunilidoxusabigake.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/p10h06ujhp3ensp1h4oati597v/53948864403.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/7rt59phi5dj5nelh36cssi5jhh/73229915522.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/85952172240.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/3146186491.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83ea5d54b5---joxop.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/31591614411.pdfIn PDF document text
    • http://hieuchuan.com/upload/files/mogusasoboteposa.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9df776365---54580614214.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd32a00dd91---40735514255.pdfIn PDF document text
    • http://go-forum.cn/upload/files/rabek.pdfIn PDF document text
    • http://secretinvitation.net/images/files/patamakubekagojuvowivawav.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/worob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=combiner+deux+fichier+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_off0000d125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD125 10784 bytes
SHA-256: 11dc67971021b3987e8a9c9cacac569a14e9dbaea3dea2a26da952408a094042
font_01_sfnt_off0000e981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE981 18892 bytes
SHA-256: ff91537c29711223994bb9c2bce3259d42b46dfbae8c6b53845f019a1fd3da12
font_02_sfnt_off0001190a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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