Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa66f8b7c2f1c95f…

MALICIOUS

PDF

72.8 KB Created: 2021-09-25 10:25:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b8ede5f3665a5a119e0ef1c8a2f6270 SHA-1: f0618fd9083350251859d6b5f044ebeba8a39390 SHA-256: fa66f8b7c2f1c95f25d370e9a5f3827f0079f590fea5d9c1de694f7c91b82e56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning model indicated a high probability of maliciousness. Heuristics identified it as a link farm hosted on compromised WordPress uploads and disposable domains, with URLs containing UTM parameters suggesting tracking for phishing campaigns. Although no scripts were extracted, the nature of the link farm and the detection names strongly suggest the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://krisoc.ru/uplcv?utm_term=keyboard+on+screen+android PDF link annotation
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144f5aab61ca---87090680147.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-16/20210916124458394220.pdfIn PDF document text
    • http://cka-shiba.com/ckfinder/userfiles/files/90413115285.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/44235179520.pdfIn PDF document text
    • https://proia.bg/userfiles/file/nexaperizepuxa.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/45518694369.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/40285079310.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/41772224027.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/76832334743.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/rusikitajexegesi.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/makaresugerabokogunede.pdfIn PDF document text
    • http://ahrestygz.com/userfiles/files/20210914_023446.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/42393271f9573befdc7dd32e5bf2dcce/30632074436.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40902307769.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zopafukugofakomutunexexi.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/f283e467d9a312ab4b1d1d0975ff14ae/56498854208.pdfIn PDF document text
    • https://senegal4d.com/contents/files/51938865143.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/kanegumik.pdfIn PDF document text
    • http://eva.am/files/6cb467b6525eba9a.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/30625842488.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/22f050e2c614ebeb8bf7bc23fa2ee1e3/tusegezisumenidiw.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/vexomidexubigoputadakipux.pdfIn PDF document text
    • http://magnanelli.com/userfiles/file/sezedapod.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/63886808313.pdfIn PDF document text
    • http://unitez.net/images/newtech/files/soluzop.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/dalukewutu.pdfIn PDF document text
    • https://petikdaun.com/contents/files/60699511332.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_off0000b747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB747 10464 bytes
SHA-256: 394590d9717aaba2b7ab4876fb256aba654b98ee2f9e13248718d05456d08f6f
font_01_sfnt_off0000cf27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE739 18092 bytes
SHA-256: d30c934fa4daad2a39699bda780699b83388f35db68ef7fab2f70bddb58d32dd

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