Malicious PDF — malware analysis report

Static analysis result for SHA-256 df7b68daaa04b03f…

MALICIOUS

PDF

80.6 KB Created: 2021-09-08 03:01:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 823c1775a41199b0640593e8ce985aae SHA-1: 81a533e8e1ed11006aa8e849bc754298dfd82693 SHA-256: df7b68daaa04b03f583672793ea71c1c667fc714ae778ca04da9028d362093ee
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 WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=ccd+vs+cmos+sensor+pdf PDF link annotation
    • http://ngnjl.com/userfiles/files/balejaju.pdfIn PDF document text
    • http://hasyo.net/files/file/roluzizukilijuvipekuxen.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/52950337697.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a69af19ef6b3002930119a7d8ff51be7/kunanegakawalixitodofo.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/a9144e6198a75e07f2f451fcd5c8a956/zuxula.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94ccf74629---fezugetadeveb.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/49997332937.pdfIn PDF document text
    • http://nenkin-t.com/upload_img/ck/files/12818727284.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/115b5af7770f18c867e5d0063bb6a36d/tukipubimo.pdfIn PDF document text
    • http://opersan.com/file/tafakuwano.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/es04vchm14td6d8jicq21pi7ts/mukosikedu.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/lanuxagiza.pdfIn PDF document text
    • https://komodovo.ru/upload_picture/90899931516.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c34a7c315---loruxabapesugovotivika.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/37477543431.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/tbkdj7v4t47setkte1bfm3uok2/81731185679.pdfIn PDF document text
    • http://partnercable.hu/files/muwosi.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/felodusi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/ebbfd0421000f474d1b589b2bdfa3d4b/xivixamoderomav.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/tusitog.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4740a6aaf---levese.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ce2e03d91---43534960338.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8d230a95c---14411304913.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/ripasomanewigun.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/22152554455.pdfIn PDF document text
    • 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_off0000d944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD944 10480 bytes
SHA-256: 835c91505998e1c45dcf0826cb9b05c44bcd5cf8dec65b8419179f649825b700
font_01_sfnt_off0000f106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10918 16836 bytes
SHA-256: db2f086b0c46e1d8467895fdaf3511ba56957832b13a613b5e6508d4e259a3d0

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