Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d556eaf99df072…

MALICIOUS

PDF

72.8 KB Created: 2021-09-24 15:34:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 44149a661f1e5a59bf578630b73cbfc3 SHA-1: 2ed2609a8ce59dcb1df0a2424c97bf20ff6dcc7d SHA-256: d9d556eaf99df072698faa8d5b429018408ded4060ebde1fdeacaec38f1831be
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://cssh.es/img/file/degokozizikijuv.pdf In PDF document text
    • http://www.fashiongale.ro/userfiles/files/bokadatudapisuxi.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/29a2b5bb597c04e7f5cf666f54f5ea52/dawotofusonowomunu.pdfIn PDF document text
    • http://friulanapanini.com/images/file/paxumazav.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/56999907381.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea3bd0fa5---xojudexa.pdfIn PDF document text
    • http://balie.overeembv-profielen.nl/upload/files/44891446165.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/79336673202.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e2c0d2ad0747d49b1f9ba2d97baaed4/32073045404.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/17485293516134ebd0dcef3.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/rumupubizeriwefenunoro.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/e70f5850d31e31027fd610e20bf72bae/89596933784.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/57160805526.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/kudifisiduligufeg.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/bukexo.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/68011242192.pdfIn PDF document text
    • https://birotex.rs/images/files/tofijawerika.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/zixibebevedibixusifededeb.pdfIn PDF document text
    • http://praguynakorn.com/praguynakorn/picture/datapro/files/89457770499.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/1940774214ba2fad78370f17b1d56e16/pegape.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9d0ec1a02---zoroxaso.pdfIn PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/sewemugepulilutexitekesuk.pdfIn PDF document text
    • http://fli.edu.mn/ckfinder/userfiles/files/nokun.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/pekagefikeborenuxaguw.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/aeb1e6ebd2e74d01a317831323f7e694/reduzilaxufukik.pdfIn PDF document text
    • https://dehayemek.net/upload/ckfinder/files/jodijoxupoxosaj.pdfIn PDF document text
    • https://dreptultau.hotnews.md/upload/userfiles/files/10611077940.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/7kr43dj8vf547tuqb4jqr43tjt/dosojefekomivipim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bunny+hop+hack+cs+1.6PDF 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_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 18128 bytes
SHA-256: 4a7ac5f076dd2d0189f74b525e461b8463e6e769fe152d235dffeb340a35bea1
font_01_sfnt_off0000e555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 10648 bytes
SHA-256: 5037bea95aec1e1fb47c11917411a9170ce446689b318ddcdc887da81013b415