Malicious PDF — malware analysis report

Static analysis result for SHA-256 817a0bac4503cc6d…

MALICIOUS

PDF

80.6 KB Created: 2021-09-23 03:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d63860dcd5fe449edfda3891f8ca6ab4 SHA-1: bc6acc9601657e935a36cec9d64137f5a2cc1c77 SHA-256: 817a0bac4503cc6ddb69ce668146e2fd661dce91cf6db06a1fb2de6fb1bdc788
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=close+apps+on+android+phone PDF link annotation
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161350de41d822---gedudalapufipase.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/96026616572.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/65005091077.pdfIn PDF document text
    • https://aurorabersinar2.com/contents/files/zamomofekabewufisotu.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/89293987187.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wutibinewilukonowela.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/dewuluw.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cbbac011f---doxexarukemibogawutuw.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/davarebozomifisulez.pdfIn PDF document text
    • https://vyaspublicschool.com/ckfinder/userfiles/files/3167264816.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/36815789478.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/59215901995.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/kegurulaz.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366287ad76b---digibebenabimada.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/junarura.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/13652491405.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/73087529367.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/49324503346.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210909_183748.pdfIn PDF document text
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/folavasolofuzi.pdfIn PDF document text
    • http://ahchala.com/img/file/73525373731.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/gepijabul.pdfIn PDF document text
    • http://uralteplostroy.ru/content/file/kixusifewin.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_off0000d7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF005 10424 bytes
SHA-256: dc2ca41c94b0702925192b4fb9bc26f6b9667e803a1b2da0ac7a362446a9cdc3
font_02_sfnt_off00010783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10783 17940 bytes
SHA-256: 6b7a1d980c7deffea87b9716d4e483c95587ecbe31411b7d99a12bc24f48dd96

Open this report in the interactive analyzer, or submit your own file for analysis.