Malicious PDF — malware analysis report

Static analysis result for SHA-256 559ef625f7bd47d3…

MALICIOUS

PDF

69.4 KB Created: 2021-09-20 11:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f28aefdd9167eac427dcc411bcf3133e SHA-1: 73c56f0829bf6e21050dd4c0f803610d9d22238b SHA-256: 559ef625f7bd47d3ac11df61ed9379abc77d6ce1aede2b97dc6d3c219bc0ba1d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a phishing lure. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting an attempt to redirect users to malicious content. The embedded JavaScript stream, though not fully analyzed for specific actions, is a common component in such attacks for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://infrive.ru/uplcv?utm_term=download+human+fall+flat+multiplayer+android PDF link annotation
    • http://nuovartea.eu/userfiles/files/81761541472.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/36941874885.pdfIn PDF document text
    • https://yensaovinastar.com/media/files/76210480477.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210917_716FF49F3BE42EC6.pdfIn PDF document text
    • http://tchid.net/userfiles/file/4875819880.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16145079482eaf---65759622897.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210918043302.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613714aae5092---58191490611.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cafd83b692---nozinawofogexemoxubipebeg.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16148093aed0f7---17715814488.pdfIn PDF document text
    • https://www.cifphosteleriayturismo.es/ckfinder/userfiles/files/xerimutaboxud.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///limitebazuvedapid.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/66752528164.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/pemetixagitimejegidefox.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/86762800853.pdfIn PDF document text
    • http://candientushinko.com/images/file/bowokoxabevovukagagu.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/56225770448.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/73123388868.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/vigapudepimaweban.pdfIn PDF document text
    • http://renknh.com/ckupload/files/87041944433.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/fomux.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/gegevikoveta.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/42388462045.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/bologulemi.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_off0000b364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB364 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7B 10896 bytes
SHA-256: f18fbaaa94c6b4f4a1794442dc62ad532f1469963f669ca5e55b839c5b91b7e7
font_02_sfnt_off0000e47f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 14064 bytes
SHA-256: ad662d6f1fd4f181209942fa3f24840637d334ef6a85441a9ad59f281ffb1a99

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