Malicious PDF — malware analysis report

Static analysis result for SHA-256 61210cad04ad54a7…

MALICIOUS

PDF

105.0 KB Created: 2021-06-14 08:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 642647785617ad526edb6f9030b78454 SHA-1: 436dc87c48adc448608d3c5d50e93fd85bae76e2 SHA-256: 61210cad04ad54a764e4359717799d41f44c2ee893b183d021b0f9d9447d81b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://smidgel.ru/uplcv?utm_term=shree+krishna+serial+all+episodes+download PDF link annotation
    • http://xboxheerlen.nl/userfiles/file/relimofimedakunerilewib.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/tusafetop.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/13528270266.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e211d8ad70b675a4993d7f89ad02339b/11188149427.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/35090935656.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/44edc8c84471d8dca58e154911dd920c/84323831912.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/99544933382.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f58e0ca316bb1905db8651cbb32737ad/79218656860.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb55f2e8fb.pdfIn PDF document text
    • https://silverwayshipping.com/userfiles/file/wijolezivewepa.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/20552655083.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/2945675644.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/62026326423.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/82335968239.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/35274266987.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.indictrans.orgIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 5304 bytes
SHA-256: 67b9c6f9f461984adceabcf25ff7f71599921fa27362e727b75b7e1b0273636f
font_01_sfnt_off000134da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134DA 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001403b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1403B 9192 bytes
SHA-256: b5d4dca359de75b6b55f3bb8eb5ba9e5eb7371fad2f97ab5e0fdd3b03e4c6038
font_03_sfnt_off00015d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D30 12284 bytes
SHA-256: 92fdbfec53dfc9a6dbde4002760f8658e0968fb6ebbf98cb69a788368055473a
font_04_sfnt_off0001873a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1873A 3852 bytes
SHA-256: a8c7047026b08898666e6e71a67c946350eb4c75da17fd1cedaa87e9c4d33b48

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