Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9b2b63031f0ca6…

MALICIOUS

PDF

88.8 KB Created: 2021-07-27 21:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c899d81de1e546312317c50f6935a121 SHA-1: ae15d7ddfadb493ca22343c1d0b60732d9704153 SHA-256: da9b2b63031f0ca68ca1c68c33347772fa356589b6e8c3f5ffb955745487cf59
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support the link farm and potential SEO manipulation for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/webiwote.pdf In PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16076953712502---pofizidulo.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/37183287708.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/dkveeln2c5c2gv3h97vum1shbk/pizotisid.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/19329921a540898c3effec1c7eee7e8c/midamu.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/5225189621.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/3955301201.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/82448906709.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/zebozumirufu.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/74737237517.pdfIn PDF document text
    • http://rghsalumni.com/clients/82979/File/ronemulomagegigez.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4156b1c0b---82808624797.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/20020159650.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0c5d7213d171a3edd81210cc6e0dff80/moxudubitugosemikemin.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73602799997.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/712e7484dbc0948caa83ab748b8b4641/tafovobusavux.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cea85d226---98183379796.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sqbve1oc29rcbj9dlsdq52a204/15740359940.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/e0c90628227354df4ef2815cb81e7981/karudotumobegap.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/3236ef95f8c4f35b494a73b7b49260bb/linegimeva.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/fimukumete.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/63p5tlonop6ine2m43iqurm9kb/weligixoxovu.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/00bf5ad10ca48095c4cc016bfe1ea165/libufifigirob.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2c403d4e---jajuto.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/69978022206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=alcanfor+y+yodo+blanco+para+adelgazarPDF 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_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5D 18660 bytes
SHA-256: 7bc73aa7b6f095f6aaf2d4be6d6af3dd720b11d410cce21544b9e926b1dc5e19
font_02_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 10732 bytes
SHA-256: 38aba7a9039276c99a8e0dc4897e946ddf69502143a3fbd42503232007d4abac