Malicious PDF — malware analysis report

Static analysis result for SHA-256 c145c11cc9a8ebe9…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 23:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2e9c6daefc1a1205c238bf4a7d7162fe SHA-1: 7f395e916cfd0402f53e1996afe8c48198f09cd1 SHA-256: c145c11cc9a8ebe9b429310feaf8f8fc342ca032fdc9b2203588f1121c040f85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=kindergarten+number+writing+worksheets+pdf PDF link annotation
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082472ee2265---69990811084.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/31761120061.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/vevobiloki.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/7js18719bmg32cbhc7fa2qncq1/49326548938.pdfIn PDF document text
    • http://derma-dts.de/files/file/negeduzagifi.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/zagogotamujev.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1ad3265958---dilewutebimusagi.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/76459920564.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/wegufepunavugafilax.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/zenasuxuluvifameki.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/26140264181.pdfIn PDF document text
    • http://slsnn.ru/content/files/wutidudixosakelaka.pdfIn PDF document text
    • http://annabarons.lv/files/files/vekasomimur.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/31616250004.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caa9d62c88---22276750099.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/1418285091.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/69035008499.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqtn322eo21b952occ09l15trr/78042186405.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/nudinesalevaronidojimu.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sigovufif.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16120a1a1cfec3---pizubekekumesinalu.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/93799488536.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/60775315525.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810f4244dc0---wuvakixam.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_off0000c0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FD 11308 bytes
SHA-256: 6e9e221e7112aa5a560809225047f3933cff937466e0c45519c68c12ac935d00
font_01_sfnt_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 17032 bytes
SHA-256: 0202e355cc9bc72b44bba4608f69fbea64027be26f060a0409c461565e14af12
font_02_sfnt_off000106ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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