Malicious PDF — malware analysis report

Static analysis result for SHA-256 e88fb67c314bf740…

MALICIOUS

PDF

76.9 KB Created: 2021-10-02 15:24:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 74fd48aefd6f95924ab98a08a4549017 SHA-1: 1612a2ddc079c5d6185e23b03ff24fc89fa831ce SHA-256: e88fb67c314bf740680fdf2a057fade7132b53c159883d7274963cace9a65e0e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm pointing to compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9757

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://queure.ru/uplcv?utm_term=how+to+get+the+d6+in+the+binding+of+isaac+rebirth PDF link annotation
    • http://surausa.com/uploads/files/37165652667.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350621cbb5e---99499998379.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/polagogatalegawi.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/45777245238.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/xisolowikidibujono.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/wadogokex.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbf53f3b71---13525269640.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/18481739947.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/faxapoxufiseviribogu.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/17970048658.pdfIn PDF document text
    • http://gazetavk.ru/img/file/pejoxibodowo.pdfIn PDF document text
    • https://linker.tw/files/34548809213.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/29098738887.pdfIn PDF document text
    • https://denimder.org/resimler/files/55517840206.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/bukomo.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/1cvgqols0o2nost8ep9l46aq9n/87839998083.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h09cigge90obn0cmrku42cq6v5/22030935738.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/93478077849.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/3751875464.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/20869048224.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614dc3712c923---13310391394.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kupozuxiwufemivasawaravo.pdfIn PDF document text
    • http://sbkf.org/files/files/dotavelunavagafumuwug.pdfIn PDF document text
    • https://implantologie-deva.ro/app/webroot/files/userfiles/files/nulitenelupuvupetulinib.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/ed6736c10db78b4f1f5707b79afe6464/36285209721.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/88921067767.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB35 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
font_02_sfnt_off0000e10f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE10F 11092 bytes
SHA-256: 95c0e178605a3b247b552352534c8bd02941c734bafcb4314f9dbfbf47c338c4
font_03_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 16452 bytes
SHA-256: 0785f2e1ca95c6f21088961348d3f2fa102dec70c3b9ee55f37f2ae8a0e6b0ef

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