Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a1a338d4779b32…

MALICIOUS

PDF

98.3 KB Created: 2021-07-23 09:43:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 5eae2c3581c26807dce016c2a2bcfc18 SHA-1: 80d2ba952dfc8c5afd256cc479aa83e76ee7ba61 SHA-256: f7a1a338d4779b32e7eb461f0c07901699a449804332a6df4ff2dc8541ffc323
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were extracted, the structure and URL analysis point to a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9884

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://vestol.bg/files/file/wisepewosopile.pdf In PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/befee306499c60f92ba217ef716d48ac/6728525113.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f00d7d6865cbf4724307da567dbf667c/22782783109.pdfIn PDF document text
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/71836984787.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f8bcfb23956---tevomuruwajavidifepefefi.pdfIn PDF document text
    • http://promador.pl/userfiles/file/keritirizu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c869110c7bf---tigavetajuvoge.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/xejujuge.pdfIn PDF document text
    • http://meskerjager.nl/media/files/90623246821.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/008f69261e759632615d180c42f3e6c8/dedokibulorozanurisagipo.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/7b0d31d44103b8d8f771955718c2f3e4/wijelazo.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/d0efc6c5ae9b771b8687059e4ba42fdf/52365816712.pdfIn PDF document text
    • https://semangkabiji.com/contents//files/27411850167.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/b8l43pigcmrqsq14868b0up99n/lovisigun.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/27297096370.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///fejelepevemejap.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/70070966023.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607750f00359e---fuzanuditi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1436c24b0---zegizewewa.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/8423c39ff278f3d77d61ae0fe26d659a/20089939717.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/30652477537.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/56754150749.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ec9eaed454d3a16df1cacd11e84588a9/bazozugonuluzoketixazipuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=entrainment+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 10420 bytes
SHA-256: ae8d74c04929b60351c5a14a1fa1766b2572e5e0778002692dd435b68b923bef
font_01_sfnt_off000100fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FC 24584 bytes
SHA-256: 0d1ddce385e9e8a4819b0295e5baaa16ee57bf4b0604e3fb17acf6acf3aea847
font_02_sfnt_off00013f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15745 16672 bytes
SHA-256: 28963d4b91f3a094e28226de65ac0d364a1d34569f36c53df4e99bff186055d5
font_04_sfnt_off00016ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EF7 2332 bytes
SHA-256: 2d3eccf9edd764c1ad2f32ec57e200754679ff4bd99b05e2857f351263fc70d2

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