Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2b86a172ce291a…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 10:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33455633848133fafd2a8da164d083fc SHA-1: f14b3cfa321f7bcefae28924d38eaddcc2bf5ee7 SHA-256: 7c2b86a172ce291aea3f4a6f3d73405fbe3782970bf3cd2b98e2f26d058b9d68
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 within documents. It also functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised websites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://lex-ter.ru/admin/ckfinder/userfiles/files/jepevu.pdf
    • https://sitarasign.ir/data/file/38599350864.pdf
    • https://petrovsky14.ru/docs/files/50074209618.pdf
    • http://goodlife88.com/uploads/files/fowowijovodega.pdf
    • http://keramann.ru/uploads/files/zebawipibanijuxobogowowop.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e925d8760c---wibadapumekuxojoralubow.pdf
    • https://inarsindbari.org/uploads/41861127425.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/63211898019.pdf
    • https://ladymamashop.com/uploads/files/202109120402013655.pdf
    • https://lombardpruszkow.pl/local/userfiles/file/telomuwojuw.pdf
    • http://dailythang.com/userfiles/files/88533912150.pdf
    • https://dynasty888.com/image/files/20210910_151715.pdf
    • http://gaishachuukobuhin.com/js/upload/files/firekugesonodadaxenipakow.pdf
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pasegejofejudolo.pdf
    • https://sharks-cz.cz/images/file/jadevakibapox.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/84b1cd88eb761aea0497de722a36a199/kesejotapadidaza.pdf
    • http://kamerton.nl/clientfiles/saxapamaxomafovubew.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/53422476969.pdf
    • http://www.chp.pl/ckfinder/userfiles/files/lezojod.pdf
    • http://kzlo.pl/fotki/fotki/file/47739122019.pdf
    • http://memsports.com.br/admin/libs/ckeditor/ckfinder/files/71688666291.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/edbd3d26e6fd5fc97343884dd17f660b/wofujodubona.pdf
    • https://nazragame.com/calisma2/files/uploads/68803796819.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+live+android+wallpapers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c9.bin
6301905619b37fcfdb869fe88a9acc8bdf5817268c31b71bb623cbc69447f808
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C9 10592 bytes
font_01_sfnt_off0000f02a.bin
45d1c1297a30e651e1b0688b6f1047366c1f735ce0c23fb44e0fbb113818b86c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF02A 18196 bytes
font_02_sfnt_off00011ee2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 16792 bytes