Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4120ced4acb1e38…

MALICIOUS

PDF

93.4 KB Created: 2021-07-09 09:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 01b70208e479fd11a4e2f14fd0c86839 SHA-1: 3a5eb088d6a2611422c8210570fa25fea36bd884 SHA-256: a4120ced4acb1e3841cf26fee9fd2731af682f9e1b56da56997746732e46b083
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://marty-triple-m.ch/inhalt/files/wofivejoserujuzavuvalowus.pdf In PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bad9e3ef6---jidonesipojejalodapaluja.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/xufaxobuxitemivex.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b33dbd5d0dd---kujidulutudawelum.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/losakejineruwanodaxul.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6d672d61a---28178168374.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/jirebovigus.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/f24bumbkca26bqk502mqt46u2g/vifejifuxipijox.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4ab7fc5c507edca53937c52f4ecb294b/jadaburumezudizirodozav.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fc85f2d6c---84571258077.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/binoziruxer.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/22147444614.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/gusebugiguxedozabatutaxel.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/2ca2caa8aed4778841a77d874a4622a8/39219867793.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/5507e45e37081f9cbd9b840b2eee4ca8/42099647035.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501175234953086.pdfIn PDF document text
    • http://geniuschulatutor.com/userfiles/files/70295526348.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/52166048398.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c3500b3deba---semeje.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d59175a3e5d95bf47710e4a6121a3d68/lerezasakunudil.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88b1b5551---mobobofulobaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+make+a+water+bottle+in+terrariaPDF 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_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 10408 bytes
SHA-256: 924442f168c58b7bf367eadd669fd58964c0334083311ffb20f95d3e8ec80603
font_01_sfnt_off000121fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FE 17636 bytes
SHA-256: 35d5017ce8ef4087e50ed49f81c0a081369275de44077fc2a584b04d4a22c43f
font_02_sfnt_off00015031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15031 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.