Malicious PDF — malware analysis report

Static analysis result for SHA-256 a29b6588088a9246…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 22:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 13a62324f71ea71bfacd593fd82ee9aa SHA-1: d7be8fd1b3449a376b1650342af60fae1612e00c SHA-256: a29b6588088a92461f6b4288d1356b2ce433ccd4f99c47918a0f2be488f08fe8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aspirans.com/files/file/65532175879.pdf In PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/9fef40e549ab7da6e2896d9f32198464/32136607075.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160aac0dfcf9d2---jupoxirerowuzo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/86940390703.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/genun.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f19506218---mekunejagixasun.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/fevekisogivukirokibesus.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90584bdb1---65339766572.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/75913390310.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/muresuzo.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/rotodonokaxidojabisefegu.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/a0rm2js0opj3ctb4i618121gq8/84172229801.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1dq9dush7r39houqnoc4l230po/41093671084.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/rumomaxanepajigad.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/rusobeg.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/35644616718.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160df92750c063---15328132598.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f81ce5ce8---tejesejededuzamu.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/lujilegizesiwijurimuw.pdfIn PDF document text
    • https://digireg.dk/upload/tiwuxiniguw.pdfIn PDF document text
    • http://finpacecuador.com/userfiles/file/10380262117.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/venubew.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/jufesidepejiwedofomolob.pdfIn PDF document text
    • https://mfdesign.hu/files/file/9360675288.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=flashcards+for+babies+pdfPDF 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_off0000e28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 10632 bytes
SHA-256: dd48f9f4fa918c6bd8f0de3c5ad2f2ca12db0118eb9714c5a9bce6278cbf4f33
font_02_sfnt_off000112c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C6 17100 bytes
SHA-256: 0f6edcabe115cf7954b6b7cb9f9a0bd8c6fa165c86f1ea3cb8041291844ba115

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