Malicious PDF — malware analysis report

Static analysis result for SHA-256 283cab5f806606d3…

MALICIOUS

PDF

87.0 KB Created: 2021-09-12 08:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e4d616cb349e63ffc6cc33e8ebeb2e9f SHA-1: 57c7b53cd1f97ece45f9210f9a4a38dbebc498c9 SHA-256: 283cab5f806606d3161c5e28884fdcd6d7b4d894fdf3f380858bfdc0a8382172
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous external links, many hosted on compromised CMS upload storage or disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=beautiful+words+starting+with+i PDF link annotation
    • http://katachizu.com/img/news/files/donudebepojigidivipori.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/tekilikodosanuxone.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/diresutelobepirob.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/5425394867.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/vevoxaxoguwofunatopar.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/85237727588.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/34497380705.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/tenozabezopuzejasozuzakar.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/40010720603.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/39630710389.pdfIn PDF document text
    • http://cjatkinson.com/userimages/51734513868.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/9448012969.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/omv7ou7kt4jejgqk6mlm5qh5j1/52748295623.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/lizufadisimovekax.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/15567753112.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161337f5833def---76588474895.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354c103b173---99642234410.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/rujukazikuvojofulowu.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/kabadorusisejukizurape.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/mevalopotetikik.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/lajubijusawini.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/23211389847.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3a40cdca3---27794285324.pdfIn PDF document text
    • http://canoeing.by/pics/files/gimetajerudosu.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_off0000ef83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF83 16896 bytes
SHA-256: 8c6afca067934ad046791a737642073d2046a21ead6749ceed5b3aa8a917d32e
font_01_sfnt_off00011b62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13379 10872 bytes
SHA-256: 0500e900e9e963f43a2b701673e0da79e5db1e78b30c784638e3642ba7011568

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