Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f400f3e0cf78f98…

MALICIOUS

PDF

77.5 KB Created: 2021-06-11 09:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 21e6311ab99034197a90483501d52f41 SHA-1: 7d3be50f011f65752ff5ee5db9486917a15fe528 SHA-256: 5f400f3e0cf78f98d52455024f1f2ad2fa1f8e591909535e3713959a4930a219
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by a ClamAV signature and an ML classifier, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, directing users to various URLs, including one that appears to be a compromised WordPress upload, potentially to download further malicious content. The document's content and structure suggest a lure for game-related private servers, aiming to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=clash+royale+private+server+pc PDF link annotation
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/40430b527b47c0865191d346d90d4a78/36612137560.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/85673706919.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/o1obalovbtrjivhf9gdp8e35ff/fevodupebufimu.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607d403747502---newomidibonojaforilakamed.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/julunuxefome.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608140cb1f214---vapegufajudomikasivivoko.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a626b803dbc---84217167490.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/vonelikikimotunijug.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/8030707899.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/b251fc8c99e9a5c4f5ef50ac2b58c691/13677604309.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608841f37038a---52696635340.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/todekowivokirufevekazu.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/lofokaxazaxopigetixulofes.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/2a75837040d6b3c75a22746758c208ec/4443223088.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E6 5088 bytes
SHA-256: 254c05da923e4a03c617c1c3d70e635d4e246f6e62e9f38f1de33ec2f1b2ae0d
font_01_sfnt_off0000fb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB35 14376 bytes
SHA-256: e8356520c4f9053ead2e400d30c4bbb966836d75bc2359be170d33f5085ff6b5