Malicious PDF — malware analysis report

Static analysis result for SHA-256 1afd2c22efef5886…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 19:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cddd7b6cf9223a5fefcbd7b9050313ad SHA-1: c59f41f315a3c395d87a68daf0928dbe2d0a9585 SHA-256: 1afd2c22efef5886487e69127f4bea24a5a1c0f36cf54e36efbf9499e0bedf90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external PDFs hosted on compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a strategy to improve search engine ranking for malicious content or to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://sieuthimayphat.com/ckfinder/userfiles/files/jiluvogevimodipo.pdf In PDF document text
    • http://tysons-cafe.com/uploads/files/49148070897.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/58503151641.pdfIn PDF document text
    • https://adeptos.clevercloud.pt/images/items/files/83535462722.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/92410918515.pdfIn PDF document text
    • http://bordahusfeldolgozo.hu/editor_up/vipijik.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/kefoburuvufijumo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131172d87827---91253666434.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/78380217655.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/a92e6bea932a5473428baff9f33dc5cc/kalapafotixovade.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/wekusigovakapizepixete.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4b20b358e---85126127508.pdfIn PDF document text
    • http://s-pack.kr/userfiles/file/20210914115544.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/96658564642.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/popoxakabeg.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/najulon.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210913_E52FC386FDF1C2CF.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/wexexajifi.pdfIn PDF document text
    • http://metallpress.info/files/26382842061.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c0b5c6732---40780228371.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/92109243890.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/25976072306.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/xerawitadag.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/xufazafe.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/pirofetatinevelu.pdfIn PDF document text
    • https://servingltda.com/userfiles/file/wuzifij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=counter+strike+1.3+cheatsPDF 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_off0000d3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E0 17576 bytes
SHA-256: 8f47307d51066dc8b9c461ff386c78cbdb171d5f1d46026e7db75dad47535424
font_01_sfnt_off000101af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 10796 bytes
SHA-256: e6b9b8b947ef174ea046914a349435a87a5f89e347d06059e62c54fdbbb10072

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