Malicious PDF — malware analysis report

Static analysis result for SHA-256 45b9666e55e224cb…

MALICIOUS

PDF

76.5 KB Created: 2021-09-12 02:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1959d0e8842cff10792fa535504158f9 SHA-1: f3b2c2fcc93f1ed4147efdb35d76cb4226e40044 SHA-256: 45b9666e55e224cb58bb3eec678f4bf508546efb4c8f6ec8775815380adeb8d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://peak-experience-japan.com/images/blog/file/16568207416.pdf In PDF document text
    • http://cdenito.net/userfiles/file/nobizesogafujelulerakegu.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/14dae1e66c4270a7d1ee3e2959785340/92140280647.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/kujukotipafutajewezo.pdfIn PDF document text
    • http://trivio.it/userfiles/files/laloperekawibabeb.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/tafodizexuk.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/lujud.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328d1e4950b---kazanupebuniwisarotujotaz.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15876287863.pdfIn PDF document text
    • http://qqwandai.com/uploadfile/file/towetofuverapopow.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/51269883946.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/pufunamodepezetuv.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/2aa87e50a8becb249f2ba497e50c49d6/71725536772.pdfIn PDF document text
    • http://sziszolg.hu/editor_up/jamituwigegumofamulofil.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6036c259e---51570842417.pdfIn PDF document text
    • https://brs.jo/userfiles/files/67539409138.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/57548911299.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/28243558413.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16309797315607.pdfIn PDF document text
    • http://ulsantour.com/FileData/ckfinder/files/20210902_69B582B841F43F77.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/44456060494.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/96092640175.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/degupisivixokedelidibub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=antiderivative+chain+rulePDF 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_off0000c986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC986 17144 bytes
SHA-256: b2d463007195a35179b0483c4d7a4ba658d52d5db1b6b3e2fc790d953a2aa574
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 10324 bytes
SHA-256: 3ac4efc9bb3e4e75934a21ff125d345bfb339c459cbcb46572c5330865c05e96
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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