Malicious PDF — malware analysis report

Static analysis result for SHA-256 eecabeab8d3e2c64…

MALICIOUS

PDF

78.0 KB Created: 2021-09-10 18:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 41daf99d7141e8741d8447c44d301e6d SHA-1: 3aef35ab14df0cf97a52f75e849c592adfb00b38 SHA-256: eecabeab8d3e2c642147101d08f2cc937c98d3bfac8403f471c9e93d5d51152c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to external sites. Some of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://ourconn.com/userfiles/file/202109010208037347.pdf In PDF document text
    • http://sbnjl.com/userfiles/files/7303658975.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/95575834767.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/jolubapuk.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/579ad624e98b75b54fdabfa80ce98a00/sabenefedogibeluriwi.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613310b16700d---molali.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/29066570683.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375399ba0b9---venubakipovizugosepopitas.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/zojuj.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/64769764873.pdfIn PDF document text
    • https://peperita.it/writable/public/userfiles/file/jazanusinafajedurinutux.pdfIn PDF document text
    • http://clinton.abwingsmd.com/uploads/files/88870899132.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/27493580201.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/1810446423.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210906_0D63F5BBD76B8DE8.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210904015946.pdfIn PDF document text
    • https://sdudyogtechnologies.in/ckfinder/userfiles/files/66235379768.pdfIn PDF document text
    • https://eetravel.net/file/59560164338.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/jexipelo.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/ramagasivabejale.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/jixekabufewufolozu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8f67a3c---punetuzulevuleroralikuza.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/demazemazuwewi.pdfIn PDF document text
    • http://119pump.net/d/files/xigofofejenatesigum.pdfIn PDF document text
    • http://www.como-grup.ro/fisiere/file/weluwedosanilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=2k20+wwe+for+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_off0000cd36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 10360 bytes
SHA-256: cd09489c8f221d4af344c49356f2aca9f9aa1985b4a20b78ab56f45baa8e32f4
font_02_sfnt_off0000fce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE3 17744 bytes
SHA-256: 58cc4896abc66216475f19b12b0d42dcfcbd54c1839545efa92396497f66e1d2

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