Malicious PDF — malware analysis report

Static analysis result for SHA-256 589651711189c1c1…

MALICIOUS

PDF

79.8 KB Created: 2021-08-20 18:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 27523d44694b2a0bae2760ab21b5fa89 SHA-1: ed55e5cd1838404417060eca73304a734f06808a SHA-256: 589651711189c1c1a0977f7800b6e46ba83837efe349d6c2ac9e6452b005e208
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress installations, suggesting it's designed to redirect users to malicious sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a deliberate effort to create a link farm for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=ap+9th+class+biology+study+material+pdf PDF link annotation
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2730dc653cf308475b8cdb047a70e550/palilifab.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/kirakomulunimuguponabi.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5baae204b9dc4978df60dd16469c2143/tetirikunalalebuvovif.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/99053932304.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4ae8b1a6f---xukabefafememifopus.pdfIn PDF document text
    • http://ficfart.org/userfiles/file/gorevuketipilidukidaz.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/hssl432okhtcqev8v5or5h0867/golanisirupugojidi.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160931fc4d548d---67644474647.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/ravukejejeritidira.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/nofuwaxozobevurefe.pdfIn PDF document text
    • https://tessuno.com/upload/files/611d1448dff77.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091461f7bed9---mifizewukadelidizigev.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4667b4faa4---19861936048.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/d51c10e9041cc83613b2b3e3de7ff5cb/buzadadimij.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/96559263025.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d263c07d6a2---41624413720.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/69888214250.pdfIn PDF document text
    • https://nadamasristorante.it/file/xugavelejiwixige.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e83de553d8---15620323662.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/15078098043.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/17d057fc2f067ceefcaf52e294fd2321/72419324081.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e34e763c54---wodufofokatukunatebanob.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_off0000cffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE814 11468 bytes
SHA-256: 03d58c0ed92799f27f74680f038fbf9cc18bd8f5f6259eae637e37e96fcb5be1
font_02_sfnt_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 17764 bytes
SHA-256: e8b6f087d4c0aa6f29b69ddf3beba1d3a9df91276bd6fd20a83f7addcfc19b6b

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