Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a4940ff8552f52…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 07:29:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b9edacc20a5b0adbd493b7ce8bcbb845 SHA-1: 46f5a10f77df543369705bf4ed78aaf6a53fcb03 SHA-256: 49a4940ff8552f521d37d4aa08459f9452f08b69237aa80fb5678d413b404efc
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the overall structure and URL patterns indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/55746ba47391ac5de6a42a50e77ebef8/wakozulefajowujoj.pdf In PDF document text
    • https://zlato-eu.cz/upload/files/72748652428.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f589bc39417---zepodaxexeputonozer.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/kekamo.pdfIn PDF document text
    • https://marosme.ro/hirek/file/30312925645.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/v3olhoa5gt2j1aec4i22bk8lta/22870592866.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c033808f3cce921f0ed89dbc47390df9/supizexosajazumusosimumef.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/tikarulaben.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/ba11d9f4befd4b6b8ad6dc07ea337d95/gojenajiwafolore.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/a7dfcaff2dc007bbe5382770dded002b/muzamorumofaxalun.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/a33ecda74cb283be7f714602a22ad617/61758882034.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/27655673371.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/wegumirebukotewubikiz.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/puduwadasodil.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/4001090093.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99ac60e59f---31480393268.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/74266566749.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cca48098e75.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ofrf386qag3b776sst2l8e1r85/23019807848.pdfIn PDF document text
    • https://majubesar.com/contents//files/juluxisovafew.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/xafam.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/riworepiwejibupu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+push+start+a+manual+car+in+reversePDF 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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001027a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027A 18004 bytes
SHA-256: ea9749c8d9d3066a69b0bc44102732de19678c588067128a678fef40eea3efce
font_02_sfnt_off0001309c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309C 10880 bytes
SHA-256: 92eba5a1ea356611916c5750e7c37de38fb3c158dac712f939e3db675cb4fea4

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