Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ba94863e39ab3a…

MALICIOUS

PDF

91.9 KB Created: 2021-09-08 10:10:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ad3406541d2c0fd8014d3eb7be3fe3e1 SHA-1: abd39e33525bd60d0c2fdfa11d21cb331f89f124 SHA-256: b8ba94863e39ab3a9e4833a5409f9f6583083db05b8aca7ec952da721f1cf22d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for delivering malicious content. The file also includes numerous external URIs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=mechanical+engineering+material+mcq+with+answers+pdf PDF link annotation
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/452419113.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/m6osh4ic047afc8f3a3q266j82/49896061297.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/78064289381.pdfIn PDF document text
    • http://bethelhanberryaaa.com/clients/2/24/2465ef4bb9bb1b7382310ae17d7cafeb/File/jufexitubolefizepofefek.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/njcfemeon3k8ki54bm7jqasrg0/nutajodemeso.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/g5tk7ej8amudhuk1gi5qhur23u/senarokokibaweduvi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc5a45f499---45651537889.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/vovafaberirot.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac621acbb0f---6787315170.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5hqfhhn0f9g90vdmqfjt35t4p2/tagoxesajigemubepopeditap.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/92dad273eae1e7ad8a7313935e9ae280/revosabodak.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afadf4e52f5---54464629041.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/55010199071.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d7bc7eca9---zubuwidarujedudagukumanaz.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/dodabikutoxituwe.pdfIn PDF document text
    • http://topp.pl/_topp/file/kerusu.pdfIn PDF document text
    • http://cutskytools.com/d/files/kufidurubonefefafetiv.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/55104999401.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d99e05bed---85044201876.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/wolamikukopovepexaji.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A2 20744 bytes
SHA-256: f1b9bb9e1ec446c4fbb9ffef9c3a0955bb5055e6b0a1a050502642a66b12dbed
font_01_sfnt_off000119ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119AE 16200 bytes
SHA-256: 467b258af6ad7a9b3c4097c86ffb487b244129930c8fa32246d0c8da861bfb8f
font_02_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 11172 bytes
SHA-256: 5b29fb9fdf88e68361eaf4f0c85ec00c85f76501f0b23538ae24cce685a9bf75

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