Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6632d0efa65d79b…

MALICIOUS

PDF

87.7 KB Created: 2021-09-01 22:48:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 07366f64e974451ba041774afb389de2 SHA-1: 7690aaf09cbebc3e4636d0e5f658d3cc3d925bf9 SHA-256: c6632d0efa65d79bb58adcdc80907acfb49e33f54db28b55594d4233e7b95416
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The document body is unreadable, but the heuristics and URLs point to a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=how+to+stop+apps+from+running+in+background+on+android PDF link annotation
    • http://lineshare.net/upload/files/20210827205511.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/sbftb0prlfuaf77oim73l9bgs3/vozedegowu.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/60715932575.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/bavomuxebomoladuriw.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/uefs70f1kjuli07goegoa7l0n7/silafusabilixazidasix.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab76020d7---sisan.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/83778469525.pdfIn PDF document text
    • https://aedwea.com/upload/foto/fabasejuxinijevogabetuki.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/07e88ae05eeb06b415d8881e3371f720/83507979551.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/64679038334.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/63540456699.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/5ced1e69fc11c371074703ca30e64a20/valudosewakiniridi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/815afa7b113a5cffbe0d77174db091e9/36279709795.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a4baa346---pesuwupaw.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/tukusu.pdfIn PDF document text
    • http://hibertek.com/image/files/20210618_122505.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/robimaftlf5khgcq1h49r13imd/62349562017.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d855e8564f0---sulonofezatumunuvoxavof.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/34bbeb86f07c722e7a68cc6cc6ad1749/simasopadunulomesiveme.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/52206899618.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/kotuzuvodevisutafipax.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca52c0071a---42389721395.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gl86sp54jgce50c966adp5c8cs/sarotakofepowo.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_off0000ef8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A6 11196 bytes
SHA-256: ad3d72783f32d9e4dd9131f7c5a444a76d0c7810d485505116e756c99ef1a4b7
font_02_sfnt_off0001217a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217A 18104 bytes
SHA-256: 2fb54b97a708bc8b04bb253f553eb9a30ca1e4a7b95dbf2ed42b3fcbd1031a2b

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