Malicious PDF — malware analysis report

Static analysis result for SHA-256 db163d904398f894…

MALICIOUS

PDF

89.4 KB Created: 2021-09-16 21:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5aca68b9ddfa47d34a0b798154e3d348 SHA-1: 080f67522ab0ef1aac8d9088be6d4f493c5c49ff SHA-256: db163d904398f8941bde1040dd8e838529f0d40ec4aa98fcc9fd2646371f0e14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classification and a ClamAV detection for phishing and trojan activity. The document functions as a link farm, directing users to numerous external URLs hosted on compromised or disposable domains, likely to facilitate phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates a malicious intent to redirect users through a network of 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://postelezmasivu-liberec.cz/ckfinder/userfiles/files/pebodulimedukosuxuzavev.pdf In PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161420820911e4---vufidejowejikugatife.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16142553c69ec0---fosoxanewemo.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/86263377576.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0caa0a74---junedapus.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/94188277982.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/80144756739.pdfIn PDF document text
    • http://giustizianuova.it/userfiles/file/60634543738.pdfIn PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/sinowu.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/kozenawapob.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/83860626328.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/47348609756.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140913b6fd8b---vidixekakanunekenosola.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/44290366172.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/luvofexusafatamakit.pdfIn PDF document text
    • https://kawanmto.info/contents/files/mobogatof.pdfIn PDF document text
    • http://www.sintsprev-ms.org.br/ckfinder/userfiles/files/92429244644.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/mafilupigamagezezutipaga.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/32688846220.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/83145227787.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/7ed348285850c0f5070cd81bd538c317/kunifaligaz.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/lasutefoduwofavopo.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nqhp36rtv74ngqo01dj1k6ooc1/kadefokexowuno.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/gefavawitilerufanosipof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=bambukat+movie+watch+onlinePDF 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_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 10764 bytes
SHA-256: 15c250a229d34239ee4dafb8274d30ddb1d3f37872c259d7b2bde2166fba8f20
font_02_sfnt_off00012ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD6 17596 bytes
SHA-256: 17c02c2ced7aea85f239d47ea4153241392648cfe086a9364c35b29ed14365fb

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