Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd3f2205371a076e…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 04:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8e7806fc23bd278f36cd63b21b89e6b3 SHA-1: 81f84e48eab8fb65114e90e0409cc556afeeeb64 SHA-256: fd3f2205371a076e594c24c4b2f234f0a4b9fb7927905601bd8066a19a449d7f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are presented as a link farm to obscure the true malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://voyagevietnamlaos.com/hinhanh/file/77565386228.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797d996d43---devafejopipuw.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/37448923244.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/dujomosomukemalidepunaki.pdfIn PDF document text
    • http://xfswchem.com/upload/files/70445148746.pdfIn PDF document text
    • https://matratva.in/userfiles/file/povidinuler.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/sufosasofizitirakud.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/90863181555.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/mipolepimejugemeg.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/baroropuzugulovedig.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/51543476428.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/giputegume.pdfIn PDF document text
    • http://deltools.com/userfiles/file/zoxeve.pdfIn PDF document text
    • https://mediaskills.rs/files/4395069212.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7fed4b92610b6530ca07915351e3b874/fofiranegoxulokizupimadog.pdfIn PDF document text
    • http://yieldpharm.com/upload/files/linufekifeketipa.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/4c045477592d4d2d8a9f428e97649592/52373072265.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/61249428723.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/dojavazevunatofazakojowi.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16132331be97bd---kuxutajizejevixiret.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/71996035390.pdfIn PDF document text
    • https://htijsr.com/userfiles/file/potiz.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/38825820561324a15900cf.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/mopefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=loving+vincent+yifyPDF link annotation
    • 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_off0000cee4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE4 21092 bytes
SHA-256: 23bd2b05f3d49e91fa0baf2296b276f55a60061e27119b7fdc0062fdbf02a22e
font_01_sfnt_off000105f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F5 10172 bytes
SHA-256: 174f2d57283ea440b737f60005129723831730aada796e2ef8ebb8cafa718b60
font_02_sfnt_off00011ce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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