Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e8b728d08be2e1…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 16:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb33604302573c0d4204609412819eff SHA-1: 94a34e7bba1381e5cb18d1a2411b4b49961338de SHA-256: 03e8b728d08be2e14eff2ceda81b22e0c285c0e031e065a93281ceac3cfeb3e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm with numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to lure users to external resources. The presence of JavaScript and the link farm indicate a likely intent to download and execute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crewmak.ru/uplcv?utm_term=free+apk+games+for+android PDF link annotation
    • https://geneticapanama.com/userfiles/file/lerovabiweve.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/vomiradabo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/64571ef00ab958ddb73ad357cdba2f59/17861465526.pdfIn PDF document text
    • https://mchs.kz/userfiles/File/52923702844.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/46598552928.pdfIn PDF document text
    • https://atlantidegattico.it/file/bojekunarajefajuno.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/9fr3q22ldefaqm1no5fkk0lusq/31733872509.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/wawitewelitemufimokifadik.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/21089735259.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/xupudazixiduba.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/12285205113.pdfIn PDF document text
    • http://smeeing.com/userfiles/files/39391661001.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/jafite.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/4c7baad9b022d433c4aadea4412e25c8/fabisafuxaterirake.pdfIn PDF document text
    • http://parfumland.sk/upl/12449915195.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/43966328586.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/48235364193.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/mexibit.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8130eddd1---gekajivolidodofujiwemul.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/92523380985.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e97c48314---doxose.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/neribijenoferip.pdfIn PDF document text
    • https://www.assessment.unibe.ch/app/webroot/js/ckfinder/userfiles/files/piminaj.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_off0000c920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC920 17820 bytes
SHA-256: e64f322607622dd8a05a0e701eeaf828c2c7d628a7d98fb0623ef306144bb0ae
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED6 10768 bytes
SHA-256: 069e8490156aa01fd257c71c102e65702d300e990b375a52521593d09277d419

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