Malicious PDF — malware analysis report

Static analysis result for SHA-256 a945547eb62aeb79…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 16:49:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a820f49d214ddd0d6e711b41d6d95999 SHA-1: a3deea6a8871c446f4518d1f2ab5e1513b7f0f7e SHA-256: a945547eb62aeb7968ab96e0702a32b1658eddc081b90cc9fee4cf95f4eec861
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to redirect users to download further malicious content, likely a phishing or malware payload. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=combine+pdf+files+to+one PDF link annotation
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa2813390---73461358769.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160becc9d21a0d---54850389825.pdfIn PDF document text
    • http://cityfate.com/files/files/7484231002.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffa21175b---16889981633.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210723_2BF867BC1D491478.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/70762552202.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/89268178907.pdfIn PDF document text
    • https://noble-program.site/js/ckfinder/userfiles/files/xutodusake.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/febomibapuxalumomemop.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/sopoxexexavenelelovipemak.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/rutexumafidoronire.pdfIn PDF document text
    • http://venusland.vn/app/webroot/img/files/91278028054.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e16d08a003---60802661587.pdfIn PDF document text
    • https://air-separation-supplier.com/d/files/83140632158.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/14492117883.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/gibozemisoredajujidevolot.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/43877dbf761079585df3953a32f60551/sisurefapejokenapetes.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ad979428---18304864186.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078b6f4c3457---17139089482.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c5db7aa0072c870f6caefb11c44594e9/51591830908.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/16398744399.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210801042128.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_off0000cd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57F 16556 bytes
SHA-256: bcc720c55e3b3baa1d7dbadb3306422f68578ddcedd6ac0e480d72f56fc5507b
font_02_sfnt_off00011087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11087 10568 bytes
SHA-256: dc28b3a0f9802796638245bbc7e17bdbd5bb944b1c3657dc3c84afe814686d3f

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