Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4780915f2acebb…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 22:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 826491b8699e83d616d797d0912ee6e8 SHA-1: 4d076fbc35bf541eb62a993497193ec6cc91db1e SHA-256: ec4780915f2acebb0cba4d200305ac3dcc97f479920d96a3bb98a8c1c3f36069
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs that form a link farm, directing users to various websites. Heuristics indicate these links are on disposable hosting and some point to compromised CMS upload storage, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=good+online+games+to+play+with+friends+on+phone PDF link annotation
    • http://xn--nellieskche-0hb.de/userfiles/file/2497877550.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/vorarepozodipixa.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a5b26d58e---80644073546.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/zidos.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/7018628767.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133fb39912ef---kebawap.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/gozidobolerepozewobi.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/46136040995.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/79134233522.pdfIn PDF document text
    • http://roocenter.ru/upload/file/51281974206.pdfIn PDF document text
    • https://monographie.com/ckfinder/userfiles/files/56856134094.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/gasetesemizirezobeman.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/98005073008.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/bikugokotanakamifob.pdfIn PDF document text
    • http://chicopharm.com/upload/files/dasevan.pdfIn PDF document text
    • https://hotelgaric.com/upload/datoteke/64774399180.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/7997bdd914c550843f9f93cd3dd5dd9a/sonodolediveropor.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5683e7033---nakovozorewowunagit.pdfIn PDF document text
    • http://esangsok.com/upfile/files/77647178217.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/jajinulunedasof.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143946ead099---punaxebatoxaxafuzoruturoj.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613568cd2fe09---jajaxemim.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/tepufagirepusotuxodina.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/jabopeduxinokokaxeradetes.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_off0000e83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83B 11184 bytes
SHA-256: 92677eab0696d8f819ef537305bbf9407ea87844d4b502a522b701b14c91aeaf
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 18140 bytes
SHA-256: 8b3b8f8faf726b325a93cb35fa41136e9188f9118ce0fb4c6c6cf02c9533d238

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