Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe1cbb01d552362a…

MALICIOUS

PDF

86.1 KB Created: 2021-09-03 00:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bc08a572d9b870ecd264a7e325438dfa SHA-1: 8b69be6208062bf38f2bf8bdd26d1de0967e245f SHA-256: fe1cbb01d552362aff70e8d94407f47584df0e82265942cd6b6c6b0628774dc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=edital+de+iscisa+2020+pdf PDF link annotation
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/34715024665.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3d2c7be7f73d726be885f7878fd1b4da/26020179582.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/40c2bb6f6c0db2b8a79e134c7be84352/kidavalifosopilabozatu.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/e1a9a718246651f29ffc0dc1a1289ec8/panonipus.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-27/20210727083057244208.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/wekul.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9b4120c208---vokibagulupogulava.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7c1bd2bfa07854062892894b86c6c702/73760102342.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/bibemobidil.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/zotoxevitegavuw.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/26867086449.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5350539fd---38140944450.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/kipem.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074192993223---nidewakiremuwezefigudizu.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/vnbkvj4e2qlm2ut6sj5d1bucuf/sotosojakukalatam.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2df1ed9ac---zebasukamazok.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/psosndsji4up9kggpjfsgveaj4/josarir.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/widubigogepepalop.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/rifinorebow.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/88502370193.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607828b9dd9fb---65951991297.pdfIn PDF document text
    • http://globalroomplus.com/bot/ckfinder/uf/files/tumumexemi.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/780bac08f547eef4cb4f93328745a337/38083783727.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF841 23220 bytes
SHA-256: c9d4bf8d0cf19693edcc1a14e2acc5eb7d9c4fc7c33dacdbd3152923223936e1
font_02_sfnt_off00013265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13265 10512 bytes
SHA-256: dae125b36d65d24815367d6228b91e17ab7985152ea7017199b8a45adb8698c8

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