Malicious PDF — malware analysis report

Static analysis result for SHA-256 6730682405c4fc57…

MALICIOUS

PDF

78.2 KB Created: 2021-09-02 23:29:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 55e93d6f95ff6b8b341b96b84206f905 SHA-1: 48e1c2f8fc1ad8a85adbf7a630367d7e563906fa SHA-256: 6730682405c4fc574c41c024ee566e962b8352b20bc73d4aca00d7d3db3ca1c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://nomylo.ru/uplcv?utm_term=learn+english+in+tamil+pdf+download PDF link annotation
    • http://myappartement.de/web/editor/files/dipikixenunesu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b0691355264---toxaxerazidul.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/75026953035.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/tutawapimedifir.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086e97716e50---22014326275.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-7/file/93326838720.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/mepaguvimiwaloz.pdfIn PDF document text
    • http://talleresjpg.es/img/file/milimuzajisava.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/nosezijisuzademes.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/zuvukitu.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/filulusitomu.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/c5eafaf0c33411e2f00da31b34063a31/14732042571.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7ce55bb78---29288551301.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/97f4c8f2630a5a91229141cd72711ca1/tuduxusowupepefuwa.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/82456412566.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1559a839b---levagutokabujubidevufe.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210620013850724104ag2zoj.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/63115598743.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210617_200640.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/42212226306.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef84ce1698---mukujevozow.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_off0000c1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D5 10988 bytes
SHA-256: 409544d4824e9405d4d6ac16a85e4a046410d74d058becb8ac7aa365c0af48d2
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 22260 bytes
SHA-256: bbfb33c63599c93c06974cc379a1503ddc8b445d09db35833a4f38228547c62e
font_02_sfnt_off000112fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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