Malicious PDF — malware analysis report

Static analysis result for SHA-256 b49c28b95aff6e3b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 11:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 1226e41f545e8144e19c7e1426a525f9 SHA-1: 4f806fd907c0307c168f1ec6b777095707f1c3a8 SHA-256: b49c28b95aff6e3bc1bba31907f0e11a5e5ad1d68140521a4bd3ad2483e2c4e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160825557690d2---netuzozimokifudamepe.pdf In PDF document text
    • https://copperscraphandlers.com/ckfinder/userfiles/files/pofepuzunigetabunoda.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/5bc967309ab73fc148c32cbf06d0490a/91365968660.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9663d9b34e---60266665504.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/28116831490.pdfIn PDF document text
    • http://etenindex.nl/images/uploads/81037693235.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/tiwusibuzu.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/4719c46b0bf49c7017887149cacb4aa8/kakipe.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/88598614356.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/34188090748.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c26583bd487---zigip.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/9008b729567cbd9ea51fa1c9d759bdbc/kidezosoberonomifagijev.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/io88rs4bglggukht3410gkclp4/wefokamalafix.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085346f42502---busep.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/nufowatibadujuf.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/9a91e8a00a3023fa4cf41ace93c54d49/96570143111.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/35222734270.pdfIn PDF document text
    • https://patc.fr/imagesfile/sufumewinivizewosixabe.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bebcf04dfe4---nimupanedeviv.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/3993707882.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/3jq7981rha6ejbq1lf4b64q2i3/16733805240.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/oj400p6lkm2o22s0hrc1mfjti8/xegid.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/b7e650c8fa4c1c6b702c15304e40f702/76511521020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=velocity+and+acceleration+analysis+of+four+bar+mechanismPDF 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_off0000f1fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0E 16768 bytes
SHA-256: 0b3ecf255a0a2e3116fe01ffc8219cab7ece6e67fd46964ecee6676233654edc
font_02_sfnt_off000135ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EC 11064 bytes
SHA-256: 5eb085cf1a4ae732611786a89e4862d0550724337302f9d0d77ea19362134342

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