Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5444b1ff3fb0510…

MALICIOUS

PDF

73.9 KB Created: 2021-09-08 06:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 10997e7598a5128cba1b9ccf9342e82c SHA-1: cadb1d25fda0bb5d4339961bcaf6e0d961b177f4 SHA-256: f5444b1ff3fb0510e63bd44cce4d75c5d0a50997533e8ec548323deda6950f0d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of multiple PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a strong effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=laporan+pendahuluan+kanker+nasofaring+pdf PDF link annotation
    • http://phannhan.vn/files/usersfiles/files/joferuzog.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/gusoloxeruvotejasafaku.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210729_B348DC26E46B86F2.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef35071d3c---55054275461.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077daf8ef23b---69001829596.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/23017623927.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/55487197130.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160adc48ae80ce---16805689066.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/69212826061.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/78752869302.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d4786e23b8f56ebfe06b00b3be94173c/lujojejinoxopusunugi.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/85641499844.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/afd5dba88bac428ec3d291a9984be6cf/42966179433.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/84444850459.pdfIn PDF document text
    • http://scriptonica.ru/files/files/19805642249.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/ruxowigab.pdfIn PDF document text
    • https://micro-churches.net/uploads/file/nojezatizokowesiriviwitaj.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c852cbc7327---rijerimonipopevepu.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/lepitaditu.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/48c279e5ba7a5efde4202bbb2cb558df/20185992397.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/30940cf19f62cde9dc64056a1ad09a51/8518968188.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1616c4818---40908575749.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_off0000beb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEB5 10828 bytes
SHA-256: 441e307707c9da0125fa5a4ca9f77560aff25f17468b9c5561a0a269d23f771b
font_01_sfnt_off0000d750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD750 16592 bytes
SHA-256: 69982397ee9994d117f9545815e414aee352b21ab7be1791529c4908feef5dcf
font_02_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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