Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f1b390a5379a7d…

MALICIOUS

PDF

79.3 KB Created: 2021-09-05 18:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 732455bb711cab0ddb37035bc79a28f1 SHA-1: 70eade0dee6bc03160d76422bac0148dd714fe65 SHA-256: 89f1b390a5379a7d70bc8796e776c3f903e527ee7019d80e7707e040c43b0908
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as a phishing trojan by ML classifiers and ClamAV. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, likely to lure users into downloading further malicious content or providing sensitive information. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd48cc1e34---xidesisakarap.pdf
    • http://emeat.ru/var/files/3411691077.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/2bd5ad17735b90787ce01560eb594be6/jarabebibarepaze.pdf
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vomopazov.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/3cacaaab44833131251e502619e0277c/zupurefafojemefete.pdf
    • http://www.vljainandco.com/userfiles/files/44863237412.pdf
    • http://tulga.ru/editor/files/tejopetabakizumubizimisi.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/b121b06a70c80e8a3804cc5328776036/zawebowimedegutob.pdf
    • https://liniagdanskzydowo.pl/files/40365100560.pdf
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160a04847efec4---tekevanisifefevamusavo.pdf
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/74681195499.pdf
    • http://i-physiology.ru/upload/terapubezexufo.pdf
    • http://driver-jazda.pl/upload/file/96188720718.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/kibojetopusaridevabetepuk.pdf
    • http://kingsap.com/file_media/file_image/file/gumesorawopabo.pdf
    • https://krzczonowice.pl/gfx/file/15688341285.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/2586578618.pdf
    • https://xn--pssa17sw71b.tw/upimages/files/81755983627.pdf
    • http://coalcreekcentenary.com/clients/5/52/52f735e63eff8706e1a2a73a20aef632/File/werupubiwivevafuberaw.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0afd0d7086---rujelewuwojume.pdf
    • http://rajskiewakacje.pl/userfiles/file/fanudiluwerabigejifujo.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/aj59scrs0cd5r6il4396n0v1jf/kiriwejuliwa.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/418ed5d5b77d936e19e7df2157f90c9d/nifesamabaxoduxupajo.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=introduction+to+business+law+jones+pdf
    • 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_off0000d212.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD212 16792 bytes
font_01_sfnt_off0000ea24.bin
6f8519f6809a877c964cd261ec5a6cc8e13b51497599644f68db6b3becedab68
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA24 16876 bytes
font_02_sfnt_off000115f7.bin
e982ce5bde244ae2c6ceb54c268eb4901dbaaf118f0152b9bec4122a69bf0bfb
pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 11020 bytes