Malicious PDF — malware analysis report

Static analysis result for SHA-256 de311f75eab2097f…

MALICIOUS

PDF

72.4 KB Created: 2021-09-22 10:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5814313b394a8b773e982cf438d28c75 SHA-1: 6131616d4d2d0e552a7d57e5fd986a1b16979097 SHA-256: de311f75eab2097fd51d4ddb5f402f94b3754fcbeb7e6afc542069206703e2a6
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites hosting other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JS suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • 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
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f531fd8949---mopejidetudosiku.pdf In PDF document text
    • http://shinaval.ru/userfiles/file/vipomisoberunul.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/nozutabofukoviku.pdfIn PDF document text
    • http://careerpathrecruitment.com/swapscan/app/webroot/js/ckfinder/userfiles/files/gaziner.pdfIn PDF document text
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/kexowalemufe.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bifod.pdfIn PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/25549893990.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614562b74bfdd---wumabi.pdfIn PDF document text
    • https://trsoftyazilim.com/genelresimler/file/pefobegidiwaxarepowuk.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/madigorixizonolor.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/33462891259.pdfIn PDF document text
    • http://eegbiofeedback-leszno.pl/userfiles/file/96207811185.pdfIn PDF document text
    • http://chineseclothingonline.net/File/76544200032.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/relunozogojedapuk.pdfIn PDF document text
    • https://atlantidegattico.it/file/tikak.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/11081055574.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/6dqk3d6b2304tim9stn55gotls/47607289781.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/93762322146.pdfIn PDF document text
    • http://hzosm.com/images/upload/File/pepasarogonuvepe.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/65671678572.pdfIn PDF document text
    • http://dfanchem.com/upload/files/fusufugilakefik.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/97542151192.pdfIn PDF document text
    • http://kbchina.de/upload/43103315560.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/86941962766.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/46875812267.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc295ee503---47470453687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+install+thop+tvPDF 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_off0000bc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC77 10260 bytes
SHA-256: acb62e3c0e1328a762a2404c6cf804803d85785a17463a8921ccd49c8d86b216
font_01_sfnt_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 15904 bytes
SHA-256: bd2415c308ad2a94f49652fa0ff32699122739cc01a0cc11d6b211a8f7208cea
font_02_sfnt_off0000fc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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