Malicious PDF — malware analysis report

Static analysis result for SHA-256 e23bc7bb6fc861fa…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 14:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 36966d1f05f91ee39ed3bf770f936d87 SHA-1: c0a997dd9db4e3694964be48b2021be539bc2ee8 SHA-256: e23bc7bb6fc861fa2fdfa3f3ed651d0a96581556562dd8d8187d459097ea20d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to disposable or compromised hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://thuocnam.xyz/images/files/fitogejedimi.pdf In PDF document text
    • http://travellightnepal.com/userfiles/file/59064958542.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/remewozexadufos.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2612dd56c9309e07267e2f72475d1712/88231181991.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/wuwolakobofabufameku.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/ripaxakifamamu.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/11867057657.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/gimijeb.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/67791325821.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/babulolaf.pdfIn PDF document text
    • http://malerbetrieb-malanders.de/Webseite/pics/fotos/1/file/pomidexavipawaxejetit.pdfIn PDF document text
    • https://teater77.nl/userfiles/file/xejutuforejobut.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613befdd0d2e8---59294200826.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/sipukosexutuzajazitamumex.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/97488373401.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/kitoderelo.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132900466380---bifajel.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/nutavavaruf.pdfIn PDF document text
    • http://rrmkaryacollege.org/rrmkarya/userfiles/file/5716746705.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/331162689.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/bimojerabewixuxoza.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/84874241533.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/jawatefoselikotuvunoso.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc4606772---12511773393.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=takashi+ninja+warrior+hackPDF 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_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10324 bytes
SHA-256: 6bc6edfe0da82a7683591606bace7134aa067c81883058122b6943f73d38fd93
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 19028 bytes
SHA-256: 5fa2dc912c38df0ed2fbd64b829f66941b3749bfd357cfe9652077b57c252af4
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1