Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee9a01af75b968ad…

MALICIOUS

PDF

78.2 KB Created: 2021-10-06 09:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 97ecc824a4e4f109b24663d24e8fbe34 SHA-1: 8bc69cab6363e6e82da3ea2140554f1771fa8437 SHA-256: ee9a01af75b968ad5c6c359540bb1b6e28b6ee76db3e2e96f82744e58c2970fd
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://vasset.bg/userfiles/file/5823473315.pdf In PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/27019376415.pdfIn PDF document text
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/gibite.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/43669087954.pdfIn PDF document text
    • https://italvaping.com/file/602540854.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/62510169233.pdfIn PDF document text
    • http://harc-ias.vn/Images_upload/files/99109257195.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/57863443588.pdfIn PDF document text
    • https://marosme.ro/hirek/file/16561463583.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/veniz.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/53154688437.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/wanutozo.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/46009754892.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d4421daad243924ac40cf6f2abca902b/29781831996.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/90533432967.pdfIn PDF document text
    • http://yasairamenbar.com/uploads/files/rugodawopunogeluxetubiwor.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/rozubuzububebinidupoma.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/37566918856.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1615d028501caf---33935451916.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/gajofonujanoxigam.pdfIn PDF document text
    • https://manenshop.com/upload/files/36193147015.pdfIn PDF document text
    • https://sanruouvang.net/images/uploaded/file/liserumo.pdfIn PDF document text
    • http://gardatrans.com/content/Files/53553833525.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/028e162fd4c411270c52a188996d2e39/rukofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=free+fire+ringtone+song+downloadPDF 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_off0000ce93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE93 17120 bytes
SHA-256: c6706bf6c0942e755044d5cbb1b4011163442464822cda7758424692abfd25f5
font_01_sfnt_off0000faae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C5 10592 bytes
SHA-256: 0336f6229c950cab5f854f6ae82632cef17eab084e3a928535b0abf5146572ec

Open this report in the interactive analyzer, or submit your own file for analysis.