Malicious PDF — malware analysis report

Static analysis result for SHA-256 49b3de4641f88d56…

MALICIOUS

PDF

82.7 KB Created: 2021-08-09 19:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5d9fc87525351e09ca509f8b4556d96 SHA-1: fd1c08d358f989b12678b7af01af823f5ccecd05 SHA-256: 49b3de4641f88d56afb22af002c4804bc000e71e2992803293a1100af37acaa0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate that the document functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://ubest.ru/images/file/xidipifadamusijose.pdf In PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/053a133cd2d859b2a5636df988da9d18/35688611166.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8947c4d58---43763852790.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/72119829540.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/6a5b7e7acb6b996da6742f49aeeca2a4/27716002171.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/rimoforojev.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609729d4e286b---83889442630.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/xagunasavikag.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/dupovoz.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-14/20210614161545743764.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/xareligumefin.pdfIn PDF document text
    • https://discovercefalu.com/_data/images/file/judokegekizume.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/84deda4bbda53f8ae7f7b4912e5e8f58/zufiril.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/b3b1d1aae5557fc244a8bed8d88fed25/61287705762.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/61238975737.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/j171onv9vaiiir6jv79p070ri8/3141034441.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/komuzimegetexew.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/kiruwek.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/44562679788.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc33109002---84463903125.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/90974650188.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/77057153693.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+to+clean+everflo+filterPDF 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_off0000ddf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF3 17468 bytes
SHA-256: eb61e19ecccb5a290a1fc3127dc67b70f5759816a73423413fd72e49ff4e53cd
font_01_sfnt_off00010be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FE 10304 bytes
SHA-256: debb7a659045156a012b5bd5ac6869f3712cad3e539098f6e760cd690df83426

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