Malicious PDF — malware analysis report

Static analysis result for SHA-256 763c58422709af55…

MALICIOUS

PDF

75.2 KB Created: 2021-09-12 19:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: beeae53f759b6e5a8ed4286dd6a6f780 SHA-1: 9b790ccf2de010729acb060d6f048fc44a75bf38 SHA-256: 763c58422709af55b52fc6a4dc3f6a8044d06eaf785d4d8bf65802d65f960a8b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely redirects the user to one of the numerous external URLs, which are part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

Heuristics 7

  • 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.
  • 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://sgrappresentanze.eu/userfiles/files/ketejoxikenofunep.pdf In PDF document text
    • http://mentaplywood.com/images_upload/files/sasemazovavub.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/58366696065.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/oibdhn5krjtgdpe9h093eca2vr/mapezetujevude.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/gituda.pdfIn PDF document text
    • http://fitviewer.com/files/file/99534273151.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/13709630557.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/jevap.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134ee2296513---31686632797.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/28741847760.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/70110534119.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/37888139831.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/neguwelakima.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/savidabad.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/52e5d8315e2ceab9a28439ba1411026a/zumav.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109111606414222.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161336fdd03520---43487465029.pdfIn PDF document text
    • http://holzbau-napetschnig.at/87221734390.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e15ed94b---32216713498.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/taxalopesigasi.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/felop.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/342851882.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/43510072363.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/7618597708.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/8dced695237a26e28b7e8bfe0a99e122/denafamitulu.pdfIn PDF document text
    • http://pololanna.com/user_img/files/43332587136.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/gijopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=pokemon+leaf+green+download+for+pcPDF 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_off0000c181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC181 10784 bytes
SHA-256: a02e3c6fccef8949501a3b258062d78323ba8ff9aea8573941e402b274b5e701
font_01_sfnt_off0000da28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA28 17332 bytes
SHA-256: 9a476d96b9def7c559b8086698e717914ab849380ac97d026ee45bdb02066798
font_02_sfnt_off00010717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10717 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1