Malicious PDF — malware analysis report

Static analysis result for SHA-256 de839e29d97d1cf9…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 01:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f556467e1e8d40fdcf3497e590f10b0f SHA-1: c28f8fb9dd6cb4a6f1f0222df03e57bde5580846 SHA-256: de839e29d97d1cf9f4c251406d8eab667b2c93e0c450adb2534dcd8438e394cc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. Several heuristics indicate the document functions as a link farm, directing users to multiple unknown domains, some of which are hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://studiotecnicobonoli.com/userfiles/files/27383970876.pdf In PDF document text
    • http://al-bandak.com/userfiles/file/1060409156.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/fubiwawasatax.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109092059573095.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/81260751150.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f0a3bf608b5162b73312a457d7b3b74f/lojujebogexaxufo.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/wixawememuwin.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/vazafufubisonasujiroveg.pdfIn PDF document text
    • https://fond.ru/userfiles/file/vozokenesesevoneg.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/78685541260.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/netuxusupumi.pdfIn PDF document text
    • http://labradory.pl/file/xujedewewew.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/72822206287.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/9b7753fce3b32e0594099fc896f5335b/latari.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea03a83df0---xididopufo.pdfIn PDF document text
    • http://warwick-ems.org/userfiles/file/muxetosebipopopawexafi.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e73a117db---gewivabusisimuvagabevare.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/popujon.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/xubapenupavenipi.pdfIn PDF document text
    • https://penal-garazh.ru/files/luwujojesudiwajowasu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372ca3de155---texefozix.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/98326365225.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/93b0fd3805c39ca6cd7435af08fe7fbc/90005919599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=connect+phone+to+tabletPDF 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_off0000daf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF0 10280 bytes
SHA-256: 630d7281296fdd8177c0d7ede951c2d611fef78cb60f900ebe2b9626cd5482c7
font_01_sfnt_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 17984 bytes
SHA-256: 2bda03f9d67c7872483f571e149c799f4b0488dd54dc891772481209469dd548
font_02_sfnt_off00011fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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