Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc56e03d038e1982…

MALICIOUS

PDF

88.5 KB Created: 2021-07-05 07:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 82782f95f492e79417ebfbd92eb44574 SHA-1: 689aabe32fa30f08c358401fb38769e1e3c041cf SHA-256: fc56e03d038e1982fe6adf055fc933a5e1c89e2231a5dc05d5d8e9512c2db948
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The ML classifier also assigned a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://phanphoiongnhuahoasen.vn/upload/files/71086975667.pdf In PDF document text
    • https://baigiangtoanhoc.com/upload/files/jepabulidiwunenejurasako.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fde650ece---xorelejibuwomu.pdfIn PDF document text
    • http://sam-global.info/files/file/vusimixikepovinebamasuwa.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/55224065216.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d7f68f7a1---simabuganebikipakupejo.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/c3b64736307d578a1cbea7b7097d1bed/dovakigoraloxoru.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/powopikevep.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be8eca4074b---gifojo.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/c2705cbbfb79cecc9cd3941429bf5757/gowosedojuwox.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a90f89cc9---rimifewaxidatiwonimubim.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/kakise.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/rvi0ah5app5prboaqcfs66of73/60994586792.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2067536ac4---jafafeduxojaz.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/mv04gr6dgmdshs46bqsv1da92o/1224678729.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/lalunogifo.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/katapinuvosoxir.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/bazitos.pdfIn PDF document text
    • http://www.asslar.de/downloads/sijopawe.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/26939636664.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/77137096177.pdfIn PDF document text
    • http://strandedtattoo.net/file/49117349363.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fu5mq3j50m3mdcvde6qqpaish6/xujupodumesefabasazus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=quantitative+reasoning+practice+questions+with+answersPDF 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_off0000f042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 11064 bytes
SHA-256: 3c918f7fec8326e1c2658e606be94fe8a898be1170ce84dd47367c3b49d70016
font_01_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F0 18944 bytes
SHA-256: 4cb24812aa521735e6246a33f69f0e4ace825c63447862500c8ccccfe12bb5cf

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