Malicious PDF — malware analysis report

Static analysis result for SHA-256 6907c4bf83320a4a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-16 03:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 25236329f264b8b0e69ccc1939091be8 SHA-1: f4145d107f668cd3ab7990d07f58dc2fe06f4798 SHA-256: 6907c4bf83320a4aa79f03fc7cfc73913fe25ba2227e6b34d568ec30ee4a7bad
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sabaispa.net/userfiles/file/94045976743.pdf In PDF document text
    • http://thevisionkharj.com/userfiles/files/fupulujozib.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/dulevukugelakokekidenebek.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/28455039274.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd2416a199---30403799373.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/28253563267.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb511781bc---75835033438.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/51641529066.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9e0c0eaa27f5c5bf94f08f285333a913/7190386544.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/45991420682.pdfIn PDF document text
    • http://www.ville-civaux.fr/admin/js/ckfinder/userfiles/files/29657554185.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/16071426025.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/49933402869.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/guzafuvutobubidofonorij.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/31456725528.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161307bc54ba7d---nitamilemifox.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/9373801c5ef233a5891774e41f3844bb/didoje.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/33264445811.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/92544365090.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/69573736383.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/4166580735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=crop+from+pdf+onlinePDF 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_off0000d240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD240 10260 bytes
SHA-256: 8e189acf74df120e8cc92b647e7d3c84d2487614936189b6c48e227b6d2c861c
font_01_sfnt_off0000e92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE92A 18132 bytes
SHA-256: 6ffd4ba6d2d12a2902e42a304ea231d6d601b1420fa55d3c9b746089bfbbb693
font_02_sfnt_off000117c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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