Malicious PDF — malware analysis report

Static analysis result for SHA-256 98146ea19856aad7…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 21:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9248a374def4a5f7b213604e9e352b3b SHA-1: 323b29434ed5dda0868c6f77c40a10ed9ed161ef SHA-256: 98146ea19856aad70dd9669abd802faadc808b1a4c13d117adbc7d0eb6f0f8e6
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to various PDF files hosted on potentially compromised websites, likely as part of a phishing or malware distribution scheme. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613929f5833a5---tituruk.pdf In PDF document text
    • http://e-sheremet.com/img/43020091230.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/42387149434.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/guzupitoka.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/vibenenufonilaxotekodip.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b79c10273---sanulemojipuj.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/43513703118.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614392a3d42ec---40624120143.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/tomafojolugegonivana.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/dejitixoni.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/gejupomaxeluturumojivukow.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/99295041156.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c779a0fecd---33989246891.pdfIn PDF document text
    • https://medius.sk/userfiles/file/41890911756.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/88533126480.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/95581504957.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/4279754083.pdfIn PDF document text
    • http://parilka.by/var/upload/file/58305861322.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/tatunuwogudugelelutatu.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/napum.pdfIn PDF document text
    • https://defi128.com/userfiles/files/82673157411.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/gezenobisonanubujaf.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/40322355592.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/mefegevogo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+prism+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_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 10504 bytes
SHA-256: c8ff21c91e554633c4031d60d8d75bda0e0cf0ad2788a5275b2ef2f096536e75
font_02_sfnt_off00010c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5E 17616 bytes
SHA-256: 9c4eac04c9d12422ba5770052b4f1fb9ac4edfd844049312c936b6d0b7748c80

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