Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f08f681da46d68…

MALICIOUS

PDF

76.2 KB Created: 2021-09-05 00:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8d1c089152662c50ac59bcf496ae1751 SHA-1: 51ea97cf51c13041c5ffb1d1acef0fc34f7354ef SHA-256: 21f08f681da46d688dfe6133dc9945169430b916875c7eb2f7019d60d4bb8f6a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b337c8e10b---lekufufujolaravomodowi.pdf In PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/a346f5d8e71cd6c039fc85f885401d01/59589431786.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7daf8bf397013bbde511d3d9a96c982b/39516835496.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/58052988918.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/900p7dvk38rgt91k0ig43dgm85/bajavegigu.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/aa3f9de7e372583b51050f73ee0be397/9652528463.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/12bfa60d57b5696ce082cfce41532c1e/begewinaxokawe.pdfIn PDF document text
    • https://menu2uplus.com/images/file/87551563403.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/58719182754.pdfIn PDF document text
    • http://shelton1961.com/clients/35589/File/56844907093.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/24095433217.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/zulurafuwuvekemajogaj.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/zusejur.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jalobikozojesubapafaromi.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fbd1bc01a---xuxapumakutodalok.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/28539192050.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vugijuvepuzopizafax.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/44996960711.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/negidexibuzolega.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/pupolufijonevetibodalanep.pdfIn PDF document text
    • http://www.nena-artspace.com/ckfinder/userfiles/files/3389413719.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021081006312673499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sucrose+definition+pdfPDF 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_off0000c10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10C 10580 bytes
SHA-256: 4e2c0e30fd99de662ec3a11b3cc4cbc76e837bf28b4f321a2f54ee73e07c513c
font_01_sfnt_off0000d946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD946 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 19212 bytes
SHA-256: 9510c2bb8b5260c6c7f37a198af372b77d6d9f7bb76273c80dfadfba456eec11

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