Malicious PDF — malware analysis report

Static analysis result for SHA-256 566038c31f679a3e…

MALICIOUS

PDF

81.0 KB Created: 2021-09-18 23:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a61fc2c4c9e97d1e7fe65158043022b5 SHA-1: 8a845b7a5a865387fda34eda7952ce7b3b332acf SHA-256: 566038c31f679a3e6b1e5a5ed11fe509d8ec9e003ee209541d1cc076412f890b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. The PDF also includes numerous links pointing to compromised websites and link farms, suggesting it's part of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

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 http://fernandopelosini.it/userfiles/files/gimupizobutabop.pdf In PDF document text
    • https://broadcasthub.com/ci/userfiles/files/72592582556.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/dufuboretoxafelenisuv.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/buzumazogugaberozomusufal.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/43688410517.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a05e9f28c---14704540538.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/49469074579.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/78453695253.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161447b31277f7---142179952.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/10168527162.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/fifazat.pdfIn PDF document text
    • https://12shio1.com/contents/files/pogoxesogodituwibu.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/11684007174.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/bunirerow.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/58974528402.pdfIn PDF document text
    • http://kgmda.com/upload/files/puzusemamurur.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db681930a---juxat.pdfIn PDF document text
    • http://babamoleskine.com/files/file/daburaguj.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d37e9b35d---97118410189.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/42016863167.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa3fvbtlgpirnu5nu9me44d2jg/gedivaz.pdfIn PDF document text
    • http://elektron.be/public/userimgs/files/sawidokekegukaropolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+import+notes+from+iphone+to+androidPDF link annotation
    • 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_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2C 10792 bytes
SHA-256: 3aacd1ed34216d5e2298e7e2c03dfa839e6107e0de94966f75210ea32cd46357
font_02_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 19228 bytes
SHA-256: fc878d14b220cbcb3e90d6844b744eb80c1cb7ff5cea06ebbbcfaba1e8da548f

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