Malicious PDF — malware analysis report

Static analysis result for SHA-256 6709a17ddcdc501a…

MALICIOUS

PDF

76.4 KB Created: 2021-09-06 01:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7704db928a3606495f477ec3e8575eba SHA-1: a8f74c3e3709005c3aabe50c71ddb6d3bb4e2c02 SHA-256: 6709a17ddcdc501ab4c7eb5634b5969d4a194de2117453b271aa3371707e065b
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous links pointing to compromised WordPress uploads and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57604c8911---kuvopepifiwipi.pdf In PDF document text
    • http://hud101.vn/webroot/img/posts/files/48217830561.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/19489634063.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/76ef362dc922b7db659810830f3c6ed9/46795027553.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf1fc9403ad---zasasulosedilunofiwu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efd503d851---61072302837.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893b6c1c31---21433497769.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7f5993ebb---15252720331.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/83905910181.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/c9505524fb10a607c4acce69c0ef2ddb/39288315216.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd9684f7a0---zizasopufuxanet.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/d01f2b77dc44665f9f7bcfe45a3561c4/bawojefosepodibumejupo.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/vufunupevudep.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/26547071125.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/wulizop.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071900334428.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/86covti00tfn4bhnhpu1obui80/kevelefenivuna.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/62403885874.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/wemokelabuzifogun.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/gokigafazaluzoxuliwelalum.pdfIn PDF document text
    • https://langumeistras.lt/i/File/41902194573.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/45c26353fac3898476de286af3b95003/gelodupixalirafagijemo.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/bimalifadoxajabewojut.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/63389581232.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/tesikabofepov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pirates+of+penzance+score+pdfPDF 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_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 16992 bytes
SHA-256: 1a5a9b850d005b9291b805e970e84ad4554678a3f484e635f30881e5b5d21859
font_01_sfnt_off0000f3c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 10628 bytes
SHA-256: fef1e1bcb4536ee6b2b9ef05dc2780f5379d83e16c611a5f86768571b061d282

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