Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3999bfd0bf12d9…

MALICIOUS

PDF

73.5 KB Created: 2021-09-13 00:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 04ad4500e87daec29cfe008f936371bc SHA-1: 92130c02cd98e4a7e30c7d067072c7e55279d669 SHA-256: cc3999bfd0bf12d9a43cb6e69e288d3a91fe41ba3c1824e9296135bbd78b67ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/voxerowosudivimepirexibo.pdf In PDF document text
    • http://epicridesnepal.com/files/23924406283.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/nudugila.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/rogerolutafewovuzojonaxij.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dd400efc7---11131404945.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/barigafatuwufegerokuwudi.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/nepalepisegaram.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/litaxifo.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lurujokopowulufudakiv.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613766294b2b4---63698018503.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/liriwitixoduxoz.pdfIn PDF document text
    • http://ijfbn.com/editor_up/55799609320.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/3280178885.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/wusijitare.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/91064351367.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/jetezuwa.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/65605861044.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/78265b854a8ed158d5b5944ababde665/16294254380.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/43584902537.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/5156280865.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/woregakoxudiwurepu.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/17712829770.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/97766059744.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/beriwanojomolezoxuru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=minecraft+pocket+edition+apk+new+updatePDF 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_off0000be1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1F 10668 bytes
SHA-256: afa4b6298111498c5c09581e05550acb59e4326b956fb165de67d0780110d48b
font_01_sfnt_off0000d6c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C4 16280 bytes
SHA-256: 394a2255f9972fc945741c8aa9c928f97b248bd6bed79a0986edb06d928ecbdc
font_02_sfnt_off0001002b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1