Malicious PDF — malware analysis report

Static analysis result for SHA-256 39c4a45faff01e62…

MALICIOUS

PDF

91.0 KB Created: 2021-09-05 21:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5d0bea5de72d08ca010cd042bdf33ec8 SHA-1: 5e7080feb569e964c10e8738a4e8f75f55b9d082 SHA-256: 39c4a45faff01e62ef77de531967826e77767fd76f4292eb0b5d27102d917edc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The presence of embedded JavaScript and a high number of external URIs, many hosted on compromised CMS upload directories, strongly indicates a malicious intent. The ML classifier and ClamAV detection further support this, flagging the PDF as malicious and potentially a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates malicious actions, such as downloading further payloads or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160871457b630a---susixu.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e582827dca---fugixutagubufanenuxepi.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8cc76e545---60904045352.pdfIn PDF document text
    • https://makenie.com/upload/files/74278481116.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/20336364432.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/fd9778fe14f3f567b848ed4f5d1f8bff/wapufagova.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160886e9e485e8---15218662950.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/julitekesefexifigu.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/77342741366.pdfIn PDF document text
    • http://iccarrentals.com/files/file/32722800205.pdfIn PDF document text
    • https://ventadeterrenosurbanos.com/userfiles/file/xatobokizodidarimoxipariv.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f57fd1bb335df91f491baf9d6c5f35b9/pipojetabekozananonukelat.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160929f2bd4eb1---25231867979.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/muxuga.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/4682b0a69ee9581bf9ac7a5f63574daa/tatumusugowizano.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/gakuxavuguvikafi.pdfIn PDF document text
    • http://thegioicamdo.com/upload/files/81892765547.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ca8389a95c8---zowarujupali.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/09c42ebf81dbe29004ba787ff0ea877a/98208791661.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a4194efd7d---xokedexokedowalozizijopot.pdfIn PDF document text
    • http://exima.kr/userData/board/file/47668912135.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/30863597842.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/kawebofezugatisuvakifubi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=product+life+cycle+theory+of+international+trade+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_off0000ffbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D6 10764 bytes
SHA-256: 0521a418121cba061d810bed49d67a26c623e3869b815cf45e9086013c1a9d62
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 17552 bytes
SHA-256: 59cb723920898f16949414a64a3e832c3de909940a7fa651e11f7d7430ec2719

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