Malicious PDF — malware analysis report

Static analysis result for SHA-256 e46497cc930937d2…

MALICIOUS

PDF

84.4 KB Created: 2021-09-09 04:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a0834a1e80e215ce247c3f81b0b82431 SHA-1: 578bbdc04212799dc729f9bec9f372de8da2b30f SHA-256: e46497cc930937d21f44d1e4d523180eda300e2fab303daf02126d9b78fda175
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. These links appear to be part of a link farm designed to redirect users to download sites, as suggested by the 'utm_term=windows+10+download' parameter in one of the URLs. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://ashioke.com/images/library/File/jujowilaz.pdf In PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135cb0921dd0---naravagusenexegefuwopojus.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/69896318063.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/pagutagopisafivuwasugo.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/62824344734.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/podawalijaluterixedisawa.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/90931743060.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/31331516805.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/7867528026.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/wulijagoka.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/33396999524.pdfIn PDF document text
    • https://cargobull.cz/res/file/5115037625.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c3c5be0ccdb0418686180bf2f1f1a5fd/60706268231.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/48617047785.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/lazowisufirogetuzila.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/xedabizuluzosuxafavefipo.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/12840451518.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tegolezowat.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/levuxolexulugo.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/dolodukane.pdfIn PDF document text
    • http://xibuhuanyu.com/filespath/files/20210901152626.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/649822e75d5147861fba2ce78aa66a96/24219229815.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/marikupon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=windows+10+download+32+bit+crack+full+versionPDF 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_off0000e379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE379 11412 bytes
SHA-256: 49aa4128779b746846bfe1e733ad06de1ee31e5ce934114bc9bb8a6ec89f9c93
font_01_sfnt_off0000febb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CD 17340 bytes
SHA-256: 06f28112247d8cae6430b7ca4799f6f2e1828594291d64c6801b0fae5f552865

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