Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b012f1eb477784e…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 16:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b9c7ac6e5e30dcd4266e9029cf356ce3 SHA-1: b339b0666f4e00b939d5779a30df162a17c1f775 SHA-256: 0b012f1eb477784e8a3ecbc24c992ba7770b007484a0caf89d6f38fd5c8a5e26
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated, but the presence of external URIs and the overall structure strongly suggest an attempt to lure users to external sites, likely for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://romanakladatelstvi.cz/userfiles/file/17494704647.pdf In PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/pitavolazejupunu.pdfIn PDF document text
    • http://wagnerfamilyreunion.com/clients/866685/File/zusudedazubetozewu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/vulenovud.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202108190406412579.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78d5c2c30c---weleninojareparupuzigib.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7eb8ba98b---tigovisorupalewetojokevo.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/mizatoduzeduka.pdfIn PDF document text
    • https://www.tristar-technology.com/ckfinder/userfiles/files/97766910050.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089fd97168cf---24809134641.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/6b7215d71cd741b1aded7c2f9abcf0d9/93386406950.pdfIn PDF document text
    • https://clinicscrm.com/img/files/65727541757.pdfIn PDF document text
    • https://faceless.me/userfiles/files/11069637396.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/6bvvl43tcghqhesghfl0055f6j/8433861414.pdfIn PDF document text
    • https://trotusgrup.ro/ckfinder/userfiles/files/30730265366.pdfIn PDF document text
    • http://mezon.jp/userfiles/file/zozidutunetadupoxonobo.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/lv8a2f6al31d3dts4vbhhjumvj/keveridunuba.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/joxupejulowu.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/41183259523.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rqeifqvpo22qsdcgpdnejl3il6/mudixenepukigopodin.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/91887339196.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/podulatufolatumeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=misspelled+words+worksheet+pdfPDF 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_off0000bdd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD3 16320 bytes
SHA-256: 81764a03f0e1975e79e0b328fa197d5958de41afc30836aef1732a6420563201
font_01_sfnt_off0000e791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE791 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA8 10500 bytes
SHA-256: d13d0d24a7d634ac2871e5d1100391cc2a5d27fb4cdf430ffcd8ca25c9a2b4cb

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