Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56c406591c47db7…

MALICIOUS

PDF

79.4 KB Created: 2021-09-05 12:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e5eefa05d53272716261b09200f85268 SHA-1: 0760e4869c2cb685aec48cd7f24a7f485c161a79 SHA-256: b56c406591c47db77e8b6440eb0dcccc93bc33c89e20c7915fdd194b0c391869
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/l8h1adrqpir28c174jqlfa0io0/kewuwigifesufatuwub.pdf In PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/313d5f6966f2093c445271bbd3cf7ccc/13763963062.pdfIn PDF document text
    • http://honda-vo.com/upload/file/vaferexa.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/35531043636.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/44682634181.pdfIn PDF document text
    • http://engineersclasses4competition.com/files/others/zakepobitixofopapifugelal.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085731ed0774---dotonoxinalusa.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/77451100146.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c976d14e0fd---47693336172.pdfIn PDF document text
    • https://www.libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/39710203506.pdfIn PDF document text
    • https://win-win-keiba.site/js/ckfinder/userfiles/files/99249382792.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/zedimuxarar.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/d642en39o10h2mupfl1g5ror12/vidonudi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/xifowof.pdfIn PDF document text
    • http://teranor.com/ckfinder/userfiles/files/80338146637.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/fopuzejoxidugesiz.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/u7tl674eh58290ltc6im2t9hu6/pitiwexaxuzewatasi.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/tipegugabozugalezopiso.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c222010e84---17641291691.pdfIn PDF document text
    • http://jngf.cn/files/file/molekevatajalovofixamel.pdfIn PDF document text
    • https://otelnamore.com/wp-content/plugins/super-forms/uploads/php/files/80c3a77b1cc6570907c39922309045d5/34930562505.pdfIn PDF document text
    • https://bataretak.com/img/files/file/93821653509.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/17518998752.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9b1e11a31---kiwasilakojalu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/085ddcce744864817a67a02ebb36c12f/jimuxovelunim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=muslim+law+of+marriage+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_off0000cab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CA 20220 bytes
SHA-256: e1237462132d37ad19607fb5dfe15b1f3eb3654a2e75dd68da68f7e77d6e29cd
font_02_sfnt_off0001170b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170B 10816 bytes
SHA-256: 0d7feb60aaa1ea7f0bfd7b242e66eb0ae255520d7b44d26693894f790de337a9