Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a540de37ae089d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 01:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 028529b46a08150446db8ec17b609474 SHA-1: 5cc242ac07e5b4232a1c749790362d34764e51c8 SHA-256: 17a540de37ae089dcdf13ee4c3081f72e70bee5fa66d1661f54fdb410c1755b4
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting it's used for phishing or distributing further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://cructi.ru/uplcv?utm_term=resumen+de+derecho+romano+arguello+pdf PDF link annotation
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c2b58a973---8929123647.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d96ef2e0e1---ninoxozetozaxi.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/dcvk5ogvush3f9bdcq9tsprou4/50026949866.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bc05v1upkorromsvkc67rah613/zewetubig.pdfIn PDF document text
    • http://spearmanhsreunion.org/clients/e/e1/e1754705b4c076d7cd520c5e9e79ed07/File/rexubagadurepi.pdfIn PDF document text
    • http://muaah.ca/userfiles/files/minaki.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/21656611660.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/bosibeba.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/35v0un5vejne59ss53u2rdpef3/26406569782.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/7024846012.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tr3g3egfqj6ncbd9uthkjuud7m/76174925299.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612c0beb172d4---241217228.pdfIn PDF document text
    • http://adveotec.com/img/file/paxumunuxuwomadutofoviv.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/61691955680.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/db52b970adfd3dfc4f4cc36543ca32c3/67071773914.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cfd209f634a765d486b24be5b596e1e9/perirakulitadoj.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/lepujizojavakeg.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c5a9e94d2---tisasafalewepilekixorofek.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64917379018.pdfIn PDF document text
    • http://cmtsport.com/pliki/surarifigepagulasidun.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210605224807.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vusagozawowo.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/81944361064.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_off0000cb9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9E 11024 bytes
SHA-256: 7a22043ae9bf650b8893777b90133f31037c5c62ae5894ea9cc6dd37a6d8f072
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 18480 bytes
SHA-256: 00358885c2c5db9fd4cfc75f9024c76d4f4ca646abb8631cedbc40668251e6a2

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