Malicious PDF — malware analysis report

Static analysis result for SHA-256 e597f031753e9318…

MALICIOUS

PDF

75.0 KB Created: 2021-09-19 00:11:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02e09edb5468df4b151e0bf996bf16d6 SHA-1: 7f5e90af2ec4a48c1a589a1525225d2655abc536 SHA-256: e597f031753e9318291dcab21f57f868c3bf28a68c2d3715f743a96292b75fdf
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting it's designed to lure users to malicious content. The heuristic firings confirm this, identifying it as a link farm on potentially compromised or disposable hosting.

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://cructi.ru/uplcv?utm_term=23+is+a+composite+number PDF link annotation
    • http://d-innovation.com/upload/files/wazekozizigovefogakiv.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210904003319_s06zf3.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/pawumijo.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141c79da7985---17613308686.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135214f47f87---kopegipefopuxanav.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161358eafc2ca9---35157167774.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161404e74b6422---22654435840.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/bosivadib.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614032045d8fb---37320090330.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16130fa1c262cf---dajelukusub.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/pugtvi82si22tvgqtpndbolb7n/jijamedomegofawi.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/kudedafofafowilimobuxoni.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///29470025318.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/gaxusidemoretute.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/96305314476.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/femexapotojulilubajelet.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/31143342429.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/67819913866.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/zobusu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/vokasubezirijirawafog.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/pubunaroxedipaz.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/54302840452.pdfIn 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://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_off0000c1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C6 10924 bytes
SHA-256: 85f51205c0d711c668a22d7b1de3951bc7b55e9b5d4ade83810591f6705aeaa9
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 16836 bytes
SHA-256: 381cb7772f65ca4178e757dacfc78ee789031c5a70b0f7ed8884d8f722c4cc4a

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