Malicious PDF — malware analysis report

Static analysis result for SHA-256 4459c11f214a2498…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 20:37:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 4298c1e0678367da6a384742b0f744f4 SHA-1: 07470988952c93dad067957025546656b7a82878 SHA-256: 4459c11f214a249826e8c0c0ab04fcd52449ae86c2c08059df8795d4557ae3bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The embedded JavaScript may be used to further obfuscate the malicious redirection or exploit PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://medvor.ru/uplcv?utm_term=comprehension+for+grade+2+english+worksheet+pdf PDF link annotation
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf3bc9e47b---vesudogajufo.pdfIn PDF document text
    • http://iziusb.com/userfiles//file/26350059143.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f0d5a9f6bae7bc23ad07e03e10c4f561/62213828901.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/36887173118.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16093d4592ebaf---96977246785.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/zuwelomolodemuxepoxafuset.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/rodiwojuzobix.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/0738002ee75abcfc87ff8af6fb0032ac/44960644617.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a9a5db18d4f15e4d7bc4bf2c841aa2df/zilesinawunalariveke.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1628066641.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/393561517611c22ad7be8f.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/liwov.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/bdfeedf9c009d74f7fb9f53a81b5d54f/95580303819.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/3931188823.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/16098be8c248ea---xutur.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/80704617175.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/kilobalewesewopazaxewelu.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/lolotagujijejawigam.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16083da1f7719f---47289378481.pdfIn PDF document text
    • https://rozgarnetwork.com/ckfinder/userfiles/files/9759698967.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/d05ba7e5deaabdb4ce152b6423a7e6ad/fopejokakitumaw.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/92669574687.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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FB 16904 bytes
SHA-256: 56e9e6272d790e314500abe867e95f197cf0b83a5d1c7bb08abf07188b66b9eb
font_02_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 11272 bytes
SHA-256: c24048f3c0c639369b857fcb8fa6a147cbf78b346a5429b9d980cf91202e68b0

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