Malicious PDF — malware analysis report

Static analysis result for SHA-256 675ae9e4df60ba2a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-16 09:21:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3567ad8b1c76158317b124e2f15ece5e SHA-1: e5cdf3a3b0f48ad7ac022116b09ce3c2a030d2f9 SHA-256: 675ae9e4df60ba2a2d274d5d3ae54777699d6ee08e52ded62c5b1d7209b36112
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to domains associated with link farms and compromised CMS uploads, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing content but containing numerous links that likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://synerhu.ru/uplcv?utm_term=tv+app+kodi PDF link annotation
    • http://www.bash.cl/media/file/wupiteluputadawikulikege.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/91457674181.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/tajuxedadotago.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/vamuxa.pdfIn PDF document text
    • http://chromavials.com/d/files/woxalamufofap.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/wunudisifub.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/kafapobejituju.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/pewavarej.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mevugodapuvenesafeto.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/38654455285.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/kuxotovimijojezetobeziz.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/mupurusegoponeja.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/48519365707.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/7000287805.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/wozapuvemepumoluni.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210910045645_udgo8z.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/ferelobito.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/34878387372.pdfIn PDF document text
    • http://goddesshair.net/upload/users/files/19313168472.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139f5fe3a29d---28844773480.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/jurufibujawufolufez.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6d9deeb0f---36088052064.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161405effeca58---lidumeloreranez.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/rukuki.pdfIn PDF document text
    • https://stehovani-ostrava.cz/static_pages_files/file/8411055105.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_off0000d998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD998 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 18228 bytes
SHA-256: 893fbb5f373b172c65b6bca8ec6e9e4ad8e9ba62ea1918161d1d4efb08cb231c
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 9860 bytes
SHA-256: 53b32de17620b811a80125be60bcd589ebeb54e67f3a7091d9aa916f2f2be24a

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