Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8111df82142b78…

MALICIOUS

PDF

85.7 KB Created: 2021-08-03 03:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3c39274916458ab39004a6f78a7ed7de SHA-1: 17c12c9e75e6fe62149773ede01f34db9e1a6d3d SHA-256: 3e8111df82142b784acaef6e3977d73be951fc07c7f872c900289211a9519953
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely contains social engineering content prompting the user to install a browser extension or update. While no scripts were directly extracted, the presence of numerous URLs, many hosted on compromised CMS uploads or disposable hosting, suggests a phishing or malware distribution attempt. The document body is heavily obfuscated and unreadable.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://alemotta.com/resources/original/file/733033877.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609abcf500e9e---26218433800.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/29017952183.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/887f72f8224f3dfacfc238b8b5023df5/wojep.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/a2e0e4a482cbb56d69787a85ca5dc636/39027549213.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/mizuvuxanixugijajoposa.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/35067460756.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/d608e9cb3b08629e376e4cb0ef8ad403/18850115027.pdfIn PDF document text
    • http://simonide.org/userfiles/file/37196278904.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078d82b4fc99---38490355068.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a72227cdb03---fuvoposejuwofidu.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/45654898585.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/gokiruwuzipobekofid.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e6d09e18ccb---zuguvapuwobetabojudur.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/0j0b3b4b4jp551839rc7ajb4h1/26061730112.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/xuxakinepigot.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c53e11ff93---45962263946.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/aebbb27599919eb3c399416e84666aca/43186194405.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/628aed95539de46e8473b9c7c2be7cca/17660794040.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/fanam.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/3hhj6psd91eiea7foev8ga7g94/xebimeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=punctuation+test+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_off0000ec4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001045f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045F 17276 bytes
SHA-256: 6d099581eab79f6ac619b2ba2912af308ff3f0614073a4afc1e1fbcd292676a2
font_02_sfnt_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 10568 bytes
SHA-256: 4aa971740fd8e6f19516661f9b597b9311cf317422243337dcbed0c215bfed96

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