Malicious PDF — malware analysis report

Static analysis result for SHA-256 6460a981990d53f2…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 02:15:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 290835f5123f99674fd5d489ca5d55d3 SHA-1: 22af01e3b8916a8d70efcd074151f1901be41d80 SHA-256: 6460a981990d53f291eec975e9763a0a8b2761fc884a1b8b6b6683426de411e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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=i+had+a+fling+with+someone PDF link annotation
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160886c3a18d5d---soneboseje.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/45753722506.pdfIn PDF document text
    • http://dimexautomarket.sk/ckfinder/userfiles/files/labulazanofivefijegaju.pdfIn PDF document text
    • https://majubesar.org/contents//files/67692430050.pdfIn PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d453e8c44d---25940946289.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/7e0578f3094b6e33ac1f7f8b30bf291a/zanasilu.pdfIn PDF document text
    • http://posuni.com/userfiles/file/85479683964.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/f073fd9a2bc2bce3d3f4613359974153/57191951003.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/puzewudiregofekarebalib.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/lumikelomigo.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1612a44975dc4f---21998482767.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/33266827188.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210808042815.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/57890824460.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/bewexotebem.pdfIn PDF document text
    • https://gw21.ch/uploads/userfiles/file/90604170452.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2402341cd3---18278733097.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/xufewa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6b2319f1d---67183465966.pdfIn PDF document text
    • http://astorandblack.net/emailer/userfiles/file/riduma.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/bowalesuvurovepudarog.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/tamulapubozotefotuzebake.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/47848970726.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/fakenupolugo.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_off0000e229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE229 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA40 10736 bytes
SHA-256: 95258145df7f5b95c26fefd0e4c54db5729fb594080fd7bce637e81adb9b6782
font_02_sfnt_off0001128e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128E 18244 bytes
SHA-256: 84baa0498e603115a7a2bcec84a5f56fb289bbe5a22bb0c036a78e3b0f04f713

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