Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6eb642913ae461…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 23:03:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c9614d99c0dcffa11f64071d814e666 SHA-1: bc2e6c178872bce034f820108de2c664b79d92c5 SHA-256: 5f6eb642913ae4612aa8de1305b853f638d4858fa71a3068de010a00822e5e17
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The presence of multiple external URIs and link farm heuristics points towards an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=sentence+patterns+in+english+grammar+pdf PDF link annotation
    • https://perfecthospital.net/ckfinder/userfiles/files/8790833753.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/80740806207.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/50772329418.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/faripolok.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/xivakoxonoko.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/106001ebdb0c195deb3f4cb6ccb9473f/dotixorizuwejapup.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ec88ad06---6287175269.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a33e4998793f07be2b6b8a0aba586b6b/memefego.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/dafenopisusegifimise.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c7877730d---93111539584.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/55295289539.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7fee69156daabb0022a88096e4e3e1fb/taramofijurijukepifovi.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160abb800eb285---xorefigapefoxufezudo.pdfIn PDF document text
    • http://berbun.com/user_img/file/22017424839.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/8283063749.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/bcc382fc920b93eba575b2d1e1c8bfb6/kakerarosasefak.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/gopsmfkvthei03g4qhso888s6o/fetikujidatafarodajiliz.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/ccuiiqb5n6dqi8sm8qu9ev38k0/59570911586.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/mafudefoberizu.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/74684272148.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87888557967.pdfIn PDF document text
    • http://jghsclass75.com/clients/f/f3/f322050927ea28328664fd088939ffaa/File/74665402460.pdfIn PDF document text
    • http://dzbnf.com/upload/file///vukexekugurujuzolazoluga.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/xaduvupe.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/xixaleveruvazugokufufazu.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_off0000bfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 16296 bytes
SHA-256: 14dc3c231ae54e64f61e35a7fadadc1106cfab4f1dbd49747f0dfff998a6fdb9
font_01_sfnt_off0000e928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE928 11024 bytes
SHA-256: 61b5c728daadd459ff361499b1e71704aeaee8971f2a7efe2a1b5ba394a9ddcf
font_02_sfnt_off0001025b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1