Malicious PDF — malware analysis report

Static analysis result for SHA-256 5283cf1d99c4ea27…

MALICIOUS

PDF

73.2 KB Created: 2021-09-13 09:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3dddf41c26339b7fad875eeaad639645 SHA-1: 55fdb062ca260bccc6f2ed2396dc410e8ce24846 SHA-256: 5283cf1d99c4ea27c59416ccb2b131c2108bcd52814822f98b2d2824a0357c1e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=mandela+full+movie+tamilyogi PDF link annotation
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cfee2c5a7---17554335482.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/93llhnt2d7rh099rflv2d6qelr/99160019175.pdfIn PDF document text
    • http://www.bash.cl/media/file/73683783398.pdfIn PDF document text
    • http://rucodelniza.ru/userfiles/file/18596291204.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/miporobosobokagogixedix.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/7d400e7dad6e7839cd91c1da8b64e15c/toraxuposusomepekux.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/6u5ju9797ts19lbdd3nh3ttla9/68130848041.pdfIn PDF document text
    • https://defi128.phpascal.com/userfiles/files/93467610595.pdfIn PDF document text
    • https://sadhankendra.org/erc/media/juvajutada.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/49509921291.pdfIn PDF document text
    • http://dogable.de/userfiles/file/22866489748.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/14179035490.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/32240064450.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/zurudewexikesizevojov.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/55896197839.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dolufoxilema.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/69764667962.pdfIn PDF document text
    • http://cf2sc.cn/userfiles/file/87134396900.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/9b80c14286492cf48401e516d2abbc54/dixoxewu.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/17780275667.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a79f2eee99---46635336982.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/lemuvixavorivakijutiwago.pdfIn PDF document text
    • http://condominiobrisasdelnorte.com/userfiles/file/nozojusazigoxikozuk.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/77451171297.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_off0000b55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD76 10700 bytes
SHA-256: 0a1e3ad439c21e51403a5d7e0973332bd804c646b462f6543a20702dffe345b8
font_02_sfnt_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 19052 bytes
SHA-256: f07c8563e87d873048ad559f314bf1f224af52f4ad87c7bdcb0557235854c2df

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