Malicious PDF — malware analysis report

Static analysis result for SHA-256 27dd6b99f31b094b…

MALICIOUS

PDF

83.1 KB Created: 2021-06-13 05:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 99cb44e9dcf64e5554c82ac29c0ed311 SHA-1: 5e622c3cc458671cb7dd393b19bc5341c5e8682d SHA-256: 27dd6b99f31b094bd4df75ee97b10b5077ece6082b45da1170e1ac807128ef72
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document body, though truncated, contains a lure related to downloading MP3s, and numerous URLs point to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The presence of external URIs and link farms suggests an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=love+story+song+mp3+download+taylor+swift PDF link annotation
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/71ea441a1a4ee35711782d57fbe70e62/nitemabegereweti.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e409622fb4.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/4fc3e43f5412e1421bd7a43bdd92c21f/gepilegegozeruwo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/e8d0c01d670ae9b8ac2e9d096be9aa7e/vuvixowujova.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/zadewokolopif.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/63663c4ba03beca9440bb7bd0e58adc0/nefaxugutojut.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/f54d5e0ab37ae5b2dd937ebb298e081f/tulizutafasidagudunawi.pdfIn PDF document text
    • https://chauphongasia.com/wp-content/plugins/super-forms/uploads/php/files/nlm31e1ns9gt8d13ikg4rms2gj/88127303097.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1b7a7152b---jasaku.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/a746a76ccdd916cade0acd3eeaf9623b/19866202891.pdfIn PDF document text
    • http://oilandgaswork.com/userfiles/file/7607638258.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/51212723986.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/s06auv2soepl3tl3ftv5qam7mj/54597273943.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb1ea663c8---kafebojuzuge.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/72758261857.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bce786b5d1---woxajamujetu.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b35784a9888---kujekiwokikilevob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BE 5508 bytes
SHA-256: 0a6cd0df7cb00510f344c1e6fcb916a8725690c4ffc175d415e5e6b05a53f630
font_01_sfnt_off00010b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B83 10912 bytes
SHA-256: c310b0dcf1c81f2ea64214517c516454c0e6571cd5dfd68df321dc3abbb7322e
font_02_sfnt_off00013083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13083 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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