Malicious PDF — malware analysis report

Static analysis result for SHA-256 40dae6c409b4a77a…

MALICIOUS

PDF

93.3 KB Created: 2021-07-10 06:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cb3d91114a5e608e9d884f02039eea7d SHA-1: 72da84d0d0e0d76a8d9cd0da40ebe4b2435fe21f SHA-256: 40dae6c409b4a77a5508cc05072d9d56ef77c0928fc707fc9855f54a5b715bab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://philabc.ru/uplcv?utm_term=esl+library+comparatives+and+superlatives
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/36636208f00910675ace0a55fcf12fdd/molonoxagiruzagoj.pdf
    • https://blokhol.com/upload/files/92538740176.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ce6776f17---pigenagevepapixubomobu.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/gnlc2lbqumu484ko7qs2pbup29/pafavotizubarewiwotibilu.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/9daba2fb96d1a5fc678ef77c10ac41f8/bunal.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/32nmovg24nqevrok8lp0omalim/gotiteburokopifuxoritafem.pdf
    • https://ajwatravel.com/wheelmarine/userfiles/file/bozalagibafalilezotivanu.pdf
    • http://sakaryakasaplarodasi.org/userfiles/file/dixegenolufasemek.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/72r38k2sre5kgidh5ijclel9la/pegilavopegivilig.pdf
    • https://aterhesseg.com/up_image/file/81286468821.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087af2c839aa---bijanuruwagonugure.pdf
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6801b565098831891e53c9c0c52a676b/rewajibipujijedajap.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607644b697455---medudifaberosuzedun.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16086323535de8---veworadinavopotolanitutu.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/t49c51olqsbag8engb9skslv54/suwezopel.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa2824a2d0---27806194001.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cdae79d50f0---63320897862.pdf
    • http://au-coeur-du-temps.com/userfiles/file/makudesigotimemig.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2e95add1a6---vufase.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/n5ejh8rm9kkm3q36jffpbrh2sp/rapira.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d8b02e965---tuwoderesekikuraj.pdf
    • http://ikuma-car.com/js/upload/files/87269547953.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/daluxatisisuwawivup.pdf
    • http://alexlunacoach.com/img/editor/file/vikuposudabetusu.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160702fb8ce14f---rutumugefonivokutiz.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105d3.bin
c16f945723c53f28384b72f588d17919eae6d80976b24c4394428c62dd8d746a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 19104 bytes
font_01_sfnt_off0001360f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 16792 bytes
font_02_sfnt_off00014e26.bin
c0ab5c5020adf921908c0e9105dea0e58583cdf10e2b3ad9c8f7a75ef03beb70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14E26 11080 bytes

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