Malicious PDF — malware analysis report

Static analysis result for SHA-256 746f48ade1b15e13…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 07:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d54c8e007a5eceb207ed33e7fd964a9e SHA-1: 909cfe0cf210ba8ec1c69ec26c44f53c615702ac SHA-256: 746f48ade1b15e13fa5fe37e29e7d5e6efcae10c5856b1402e1dcc8b07a61b5d
204 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of embedded JavaScript and numerous links to potentially compromised WordPress sites suggests an attempt to host and distribute further malicious content. The explicit instruction to disable security software is a strong indicator of malicious activity, likely to facilitate the execution of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://banquat.com/userfiles/files/86021406855.pdf In PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/50711939605.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/56719904368.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/61866564036.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fipexexavebeleko.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/26335303533.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/55792196841.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/ludarodibozokodirumaxokuk.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d261e676a2---76303952243.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139a9abb0731---43884822577.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/a6jfl2egtgsjfd7g8ospiol4g0/pinavavonirerumanapekidej.pdfIn PDF document text
    • http://deltools.com/userfiles/file/bipipuwo.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/2264460910.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/fexematidepisaduvujuda.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/bobebixuxexomot.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/nutifutarefasolewitawago.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/1873071744.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/vebisiruvorajujudaroz.pdfIn PDF document text
    • http://simonide.org/userfiles/file/sitotububitizusokipezemi.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/28227133173.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/42540583568.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eba61c4e0f---wesapozazebobimobolufes.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/pumop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=keep+application+running+in+background+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_off0000dd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0D 10844 bytes
SHA-256: ad9aa36a1a3d24a43d1b550544d17eb53c1c2457c87c702279e48f1fbc301694
font_01_sfnt_off0000f5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BE 18264 bytes
SHA-256: 5126546a06b6544f613b99c86236ec5f2bdbc9ecc3ef3698131acf578497fc52
font_02_sfnt_off000124ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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