Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b2f660438d4f66…

MALICIOUS

PDF

71.4 KB Created: 2021-09-09 00:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8035c858e7cc659ce8303fb47d58b86b SHA-1: f5c8d98532f38d4f52ad7acd4ea3f8ef965cef3f SHA-256: f7b2f660438d4f66b24784612c294ecc43972dd3338396be54fac3a6c3dfd85d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://adance0112.com/upfile/editor/file/gumunudakakoko.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9aa872cc---gakojuluturaxajusor.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/mujid.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/72786930086.pdfIn PDF document text
    • https://simorgh.it/uploads/file/dujudenofarezixeb.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/madoke.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/70140134488.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/4211446530.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109011105507670.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/xamumodiworu.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6391948260.pdfIn PDF document text
    • https://dubaimotorcycletours.dubaimotorhomerentals.com/uploaded_images/files/lokoteravi.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/dazisixerepukuwebidanan.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/20345192203.pdfIn PDF document text
    • http://creationart.hu/files/file/17804000701.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/mavinekeza.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613711a54f142---vinaliwoginijexunagunapi.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/widivujenitademiri.pdfIn PDF document text
    • http://ecoevopublisher.com/files/upfiles/file/buxatutiru.pdfIn PDF document text
    • https://zemtechnika.lt/public/site/0files/xikuzotepulemivunor.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5hg2psfsj80pc6nqjlddg69taa/zemoluwodozolifirepejare.pdfIn PDF document text
    • https://ginecologmuresan.ro/ckfinder/userfiles/files/zijukudumir.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/jenajesewifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=skachat+film+na+telefon+androidPDF 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_off0000b23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB23D 10740 bytes
SHA-256: 909f751a824c09f12f2964fdeda3adf31aa7d4f916c6bba825c2e4fcb2b60c9a
font_01_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 17068 bytes
SHA-256: 0648ede0eecdb221f16819fe48c77003a63c7c8d90446375af5783da96169c2f
font_02_sfnt_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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