Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71cb0a6ec6a9b95…

MALICIOUS

PDF

85.6 KB Created: 2021-09-02 06:43:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a4022f9ce81e63bf48a0513dcbc3c4bc SHA-1: 2b6dcc75ba1c375be84946e9dad6e2aadbd091f2 SHA-256: d71cb0a6ec6a9b953b5a7530be5b83a68798a48aa8d82aa56095288534ce2c18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is part of a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting. The embedded JavaScript likely facilitates the redirection to malicious sites, which is a common technique for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 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 https://sasalidayanisma.org/uploads/file/916458337.pdf In PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e354d3b069---82184270453.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021072618084935.pdfIn PDF document text
    • http://www.ishvani.com/www/js/ckfinder/userfiles/files/15952578493.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/fdlnl1npbl5aj15q0mbsgcrdhp/61173721240.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/87899640972.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/43903682462.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/36134838883.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa09edb62d---53787482848.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fevividabidamovu.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c2ef026ececfeb3b93ecabb38c312ece/64343473690.pdfIn PDF document text
    • http://whatdwellswithin.com/file/tuzugamimigijugofeva.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/mibunixojilur.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fb104538f---9898458592.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/0de6b3e8e21205758d19b8cd5575b14b/89592148092.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/2fa94360ddbbfd1eab7c340c5ffb7dcf/88375358925.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/nazitefawesoki.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/7a38c4137090a0a9f1e1b7f20b5ab273/juxefakakopojewixase.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/03277ecc0feb38102a3a2273ea5093b5/63490793933.pdfIn PDF document text
    • https://indiantalentjunction.com/milan/media/luros.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/8725002794.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/f6uctut4g3a6b40258282v8vi0/49143147629.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3291a5144---78956078504.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=tepal+of+a+flowerPDF 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_off0000e2d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D7 9936 bytes
SHA-256: 53122178ef93905600ca8ee83c6f5a2a97520a6e98a248d62b94888c32df2984
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 20816 bytes
SHA-256: 50cc340ee3e11ee7e6cdc248b60655daa85eb4b8bbddd22eab31dae2dbfa9683

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