Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4606df257b04586…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 08:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3f36bf37705671f821ceae7d8b2cf82c SHA-1: 0ddca3b66420eb242615c553cf0ad5925f558e3e SHA-256: e4606df257b0458661223619e805ff03ad5047656239bb5534990efc2ea5a6cd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and link farm patterns, indicating it's designed to redirect users to potentially malicious websites. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent. The presence of multiple compromised CMS upload links further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=redondillas+sor+juana+pdf PDF link annotation
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/nc115k3g7mp60qfjrfsl8pc7ka/posikiziw.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/61077129273.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/76681518849.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/wudamodigumosokimeleboti.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/detemavabukimutava.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085741880a3c---40888495261.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b42c2d6b42c59c6185109b2999a38cc2/temati.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c23a22d2e8---77829634049.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/59538315376.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/soxeb.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/3b87e78f28bd814fda485c7ddb6c8120/84637100955.pdfIn PDF document text
    • http://flexa.cz/docs/file/pologuxeralu.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/nalixepiwatitavowefekuj.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/96210561873.pdfIn PDF document text
    • http://brandiassociati.it/userfiles/file/xoluveresesesifegupakoget.pdfIn PDF document text
    • https://digireg.se/upload/xuvobugogizovimefajokume.pdfIn PDF document text
    • http://camptagola.com/clients/66689/File/40546154525.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210701175909_1817756548.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089081c6cd83---jukoduduladomozogudogipi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c8dc511c5---27047822941.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc5dc72331---7889887364.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/70247186578.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_off0000c705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC705 17740 bytes
SHA-256: 52552e0ecd2664c069e59f606507e2f86f5b23036cec44f0446ff19d9a08ab8f
font_01_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 10668 bytes
SHA-256: 79b198c031cc560124cb81cc3082aef1c175313cdadf9a4bfb8124416a84c959
font_02_sfnt_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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