Malicious PDF — malware analysis report

Static analysis result for SHA-256 9100f64a1c7ee759…

MALICIOUS

PDF

69.2 KB Created: 2021-09-29 09:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 023377f3722fcef54d1b1361b74eeb34 SHA-1: 3c603966971ef64c2ab4ad890ee8f5efd413f092 SHA-256: 9100f64a1c7ee7594e6baf84fa0404a9645229c93bf0eec1b60fa9e24270afd0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://memsports.com.br/admin/libs/ckeditor/ckfinder/files/rifuv.pdf In PDF document text
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/54103010299.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/fagisetaxubaloxofe.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ab771eaff11f3f45db8d6512c435dd09/4276065120.pdfIn PDF document text
    • http://techbis.pl/files/file/neteramewoluxudopupegim.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/16335487686.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/290073281.pdfIn PDF document text
    • http://showpelec.com/data/file/20210912_065120_649.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/loxonexenozutano.pdfIn PDF document text
    • http://imi.vc/upload/files/79448826622.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/21492393627.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/rerovi.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///70328295109.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149895820199---70664621824.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f35213d037---xejebisig.pdfIn PDF document text
    • http://kmsenior.org/file/files/limujuloxupo.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/kubenabogupozodezogogu.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/37234742838.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/85235292052.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/vezulizaderizim.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/gugokurodojejonafuxebi.pdfIn PDF document text
    • http://e-hematologica.com/users/file/favireberefemumatopefodud.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/69641083145.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=warhammer+6th+edition+army+books+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_off0000ae6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE6A 11224 bytes
SHA-256: e536233a567b07320867417072b571f903f8ac630397c5fe2ef48b3ca13b63aa
font_01_sfnt_off0000c864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC864 15568 bytes
SHA-256: d91306350be51bbffafe920b11248cd4504d8b560d7eafbf16de80aea16090d4
font_02_sfnt_off0000ef8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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