Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a439c5194f591e4…

MALICIOUS

PDF

82.0 KB Created: 2021-09-06 01:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f7060a16a3ca08388cc86b6e59eda71 SHA-1: 1f90faddf891d8a219c4deedded6e15d35e5f6b5 SHA-256: 7a439c5194f591e496732fd0bbe2d4885dd035f6e72de23ea0a1b5aedada42ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also contains numerous external URIs pointing to compromised websites and link farms, suggesting an intent to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious activity, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://philabc.ru/uplcv?utm_term=webshoppers+36+pdf PDF link annotation
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/4353fda4a67cd53a68cc75fe4c3765b9/37970990249.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/duzanaxabebe.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/rimas.pdfIn PDF document text
    • http://zae.me/datafiles/file/lotudenetavenano.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/tonifomanotowal.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/35441172835.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/dc4e97b5427ff7f09ed50fb3426282bc/22030532494.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/dosunufumobijif.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/zifalolimusebemodenipa.pdfIn PDF document text
    • https://bookatowncar.com/userfiles/file/72410071911.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8adc5a7ea---94506330331.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/molazatimedazumediwu.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/44903815263.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/63bd876357e60e714f98a647273e757c/zelomolode.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29154e6b5a---jefusunizisowu.pdfIn PDF document text
    • https://qqhanoman.com/contents//files/26991385349.pdfIn PDF document text
    • http://temple.mo/userfiles/file/tixerowepedudufetidut.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xedinegopikalewefubini.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/c756c9009405e06c9c1177ddf9fba1c2/moratoboj.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e35de9e6e9---vosifuzixonuw.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202108272114191627.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/59889757411.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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 17496 bytes
SHA-256: ba769d306b851c70aefed46c5cc5b22cdcf93e66429b24f3e4183c069fc67082
font_02_sfnt_off000122a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A6 10568 bytes
SHA-256: 0ff46f062501225d7417cc2ba6984afc7934d8a8f09aee4b158392f038d59add

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