Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d6ba614c39bdbb4…

MALICIOUS

PDF

79.2 KB Created: 2021-09-09 21:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b9a61de5f4bc369004cecba71dd41e6b SHA-1: b3fe784892a79966d3997b579e9a9b74670b919b SHA-256: 4d6ba614c39bdbb4a3223e818a85e97a3d253334d0e436e156a53cd0669d2b01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9b5d13e4---84175135320.pdf In PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/76371376900.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/gezatuzirokisivozi.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/komomuwotanadebimisuzepi.pdfIn PDF document text
    • https://renewone.de/files/78524640717.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/vagiziduvikokaxogabuvuta.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/86507635370.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/pelosovaxukukovojuwomu.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/detesogifarineruxipirefe.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/jamivovijusadulaj.pdfIn PDF document text
    • https://rafautama.com/uploads/file/49300523205.pdfIn PDF document text
    • https://sdhouse.info/ckfinder/userfiles/files/57268910167.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7db4a25eacf3fb5e6527a96f94c4478c/73751904204.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/77303237886.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161391e6edd541---tunususawumoxi.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/37718075758.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/guwumabovakujefuso.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/78638745255.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/16609765253.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/gazomitebekaw.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/mubafeterapovonu.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/kisipiderapobonit.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/96257629630.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe42da4b9---jupuxuxe.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338b47a0e21---nerawezokafe.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/87506457279.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=android+uygulama+%C3%B6rnekleriPDF 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_off0000cef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF7 10824 bytes
SHA-256: e2710b2b1edfec61f8f7f7d8d192b8df3808e10299bee32a94df614d60c3905e
font_01_sfnt_off0000e754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE754 18660 bytes
SHA-256: b80ff3c869aaa570eb31cb19e323a42c9696e9dde72edb1edf25bac6ad0bf2ee
font_02_sfnt_off0001153a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1