Malicious PDF — malware analysis report

Static analysis result for SHA-256 718b3470aa075c81…

MALICIOUS

PDF

74.9 KB Created: 2021-09-11 11:08:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1987636603e519eff45f444c8cfeabca SHA-1: 7eaad55941d0e4ca4c6c62f4984849b90d8e3499 SHA-256: 718b3470aa075c815a2122f2617c777b412ab3a3b58e535d527f6ae470be12b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=how+to+convert+heic+to+pdf+on+mac PDF link annotation
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/65umnudu3aa6t3t7ediu8p9ts1/5472619745.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/rifaperidomosofaxinik.pdfIn PDF document text
    • http://paramountswimwear.com/userfiles/files/53150518814.pdfIn PDF document text
    • https://hattoco.vn/images/ckeditor/files/85431370250.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/cca2eed2e37a75ac5c77de1fff78b3d2/16177959033.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/90688266857.pdfIn PDF document text
    • http://resheto.ru/users_images/fck/file/69801520591.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7c4115720---zupewamiteribeniligogi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cab7d8fba---19220018214.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/1792376832.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/58633195.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/66480332148.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/bimufuxafenuxivitu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/7d759dce5f40257d96773d5237e2d617/natulovoduto.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/wufavanetap.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130855a9895c---mudigupujibu.pdfIn PDF document text
    • http://madang.eu/f_pds/fck/file/wikesofimojotemixugizebi.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/8336962122.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/mumefikudosa.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/xenapegojefarobasim.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161381b6b47cbf---bajuve.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/supon.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/wozefuwupofitiji.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_off0000c35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35D 16336 bytes
SHA-256: cca6bb71f376f88a9815038b1a2b7d1914ffc8c9f96213dd9e186d5c1586d4bf
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10816 bytes
SHA-256: 019e84d9da41b249513e122deef7b5648fc123b64bf8cc46d1376e083852bf2d
font_02_sfnt_off000105fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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