Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e14a59598db155e…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 19:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fbe215d80def58b9bbd1334408e8d12b SHA-1: b0c75dac735d5f8dbcdbf8fa06837d80d72bfa0c SHA-256: 1e14a59598db155e35a6ab5e98c196d331fc8766d2af6bcda8bef2e7467518db
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is part of an SEO poisoning or link farm attack, designed to drive traffic to malicious websites. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cructi.ru/uplcv?utm_term=my+hero+academia+season+5+anime+release+date PDF link annotation
    • https://rajnnuhiddje.se/userfiles/file/zukulukumumivuxomuxele.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ec73b1cf6a2da53078191cf4a98181f2/4744849461.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/23114358541.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/lowevipujodezevag.pdfIn PDF document text
    • https://unicorn.mn/js/ckfinder/userfiles/files/dinowexafow.pdfIn PDF document text
    • http://thewhitmerlawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27201516280.pdfIn PDF document text
    • https://t-groupvnxkld.com/uploads/news_file/55262496889.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/11548803739.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/37276058135.pdfIn PDF document text
    • http://stlnsk.ru/uploads/file/41771177473.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b05303e15a---filinopifezevu.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/jerafofonelon.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/89426899841.pdfIn PDF document text
    • http://hidramaco.com/files/files/27429420194.pdfIn PDF document text
    • http://fittbikese.hu/files/file/guxedidaloxoxejafetuke.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/5207684740.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/xemufipupumudejanifek.pdfIn PDF document text
    • http://gnatowski.pl/attachments/file/40758539981.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307def6d376---99014333431.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/7991976168.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/nidipe.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/menafimibufabamamanuwezel.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/a42638e32dfd5361dce04c791c68e7a2/37074184370.pdfIn PDF document text
    • 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_off0000b34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34F 10876 bytes
SHA-256: b960c0ac23bdd5d392789027f02dbb49ac369cb9a263c30859e8c3752f9e24de
font_01_sfnt_off0000cc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC53 16288 bytes
SHA-256: 2558a3348cf94d9781e814071dbd4a80e6ad852781f47eaa7c1c6723f8cea154
font_02_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1