Malicious PDF — malware analysis report

Static analysis result for SHA-256 26317b9c43da00cb…

MALICIOUS

PDF

71.8 KB Created: 2021-09-07 16:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2479d2832576317d78d677ffc34c749c SHA-1: 5df5c1fe5b8f941b09b04277fe15dd32a338c707 SHA-256: 26317b9c43da00cbaa7fc8e51af5c6f356564b3c635ff57fd7b6095973298581
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=simile+metaphor+personification+hyperbole+onomatopoeia+idiom+alliteration+worksheet PDF link annotation
    • https://filetorme.com/upload/files/rupexevokowo.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/7133351362.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16098c2541effb---fazakosusutimus.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/f6gqmgvnb8uegaevjnutps7phr/napuximofesetof.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0bd648b4---xomesatuxuwatijojuziwe.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/54070908449.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/39980070221.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a9ba7d8c3---bixapebud.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210807171901.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/kiresap.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/podevekev.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/siwekos.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105161852182942.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f74e9fb56b8---guxaveruweparotew.pdfIn PDF document text
    • https://aspirans.com/files/file/16379131329.pdfIn PDF document text
    • https://ksboutlet.com/file/files/23811515479.pdfIn PDF document text
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/43rn464kl5e80ddf6tl85d2no4/gatuv.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/munulipajafizamasijiju.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/8pq07r1qu50lrctn2903vkuojn/sasuvefegikazuwonopepefu.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/163d8a56b594897cc4933aa85eca15c2/90499204485.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c81614f69a---44349210738.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22ef486ff---fofatuduzakosaginewix.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/lajewogusavipudafasim.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210903_070110.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_off0000b5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F3 11392 bytes
SHA-256: bcb2d450edde5031e0a370a079548364eda2e19808ab9e110ee80160aae387e6
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 15796 bytes
SHA-256: bfaeed07beb69009d6055bb971918871b1faf762272380487ed81d85017b4425

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