Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb379b033d87e864…

MALICIOUS

PDF

95.2 KB Created: 2021-07-14 04:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1383cb01bec56a46fcd8e71a9afdb99e SHA-1: 7c18b1fbfd5a7af55aeb3277cc44c58570ede8a1 SHA-256: fb379b033d87e864d2e19d708966f68ee9a07bba601b0cc9c0430bbeb2999900
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics indicate the document contains multiple links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI heuristics suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://zatacorp.com/upload/files/87863034860.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/cc268d1b2572b4339fbe6d4df23a02fc/pofawuxusugexibulidavedev.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e5cb60c70ec---zaxenixazipoxibuxexajo.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/menigafalukoweru.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/dc790rumj16atr92cjurc5n6f1/kobokuserolawekebilirulev.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/014978f83bdd49a0a6083d4411719d7a/65464652820.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/l6s3mpb4i1sas3sgd4u5ieborp/gerix.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/eqnvionvtu962okobk1ielh22f/24460777144.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/difotoxevafoxes.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/wivepapexokoxop.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f16cab5fab---63726844517.pdfIn PDF document text
    • http://learningkey.org/userfiles/verum.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8a61f9a74aa71c451a9778d6c38cb247/maxilijuvatiwukixuvi.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4ac67a8b---24292084569.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9d7258e6d---30489382775.pdfPDF link annotation
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094d06059627---fumej.pdfIn PDF document text
    • https://brs.jo/userfiles/files/67771954589.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=civil+engineering+excel+sheetsPDF 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_off000112a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112A2 17504 bytes
SHA-256: e7813e2cc18fb801cc793bdab2141b51e0937807a8c6fd03dcba0d4dce336f01
font_01_sfnt_off00014075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14075 10424 bytes
SHA-256: 9d6df4e4630cacef7c768530d999cc7067d810d4e7dd7b8dd071f8a9499adb24
font_02_sfnt_off00015811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15811 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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