Malicious PDF — malware analysis report

Static analysis result for SHA-256 9918d58b89317d6c…

MALICIOUS

PDF

77.2 KB Created: 2021-09-26 15:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9585bcfdd33042694c0ce55a1cc61cec SHA-1: 9248f886109fe43033511c34dcc752a89275aa6f SHA-256: 9918d58b89317d6c6332a3a3d2beb0f5f4aa442c1119e61e3e0379e9ca69578f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO poisoning to lure users to malicious content. No scripts were extracted, and the document body was unreadable, limiting further analysis of specific payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://khanikango.in/file/nudirufabilarune.pdf In PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/29312657541.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/taromamivedit.pdfIn PDF document text
    • http://benetworkingpro.com/ckfinder/userfiles/files/jopal.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613067ea9dabd---93716971468.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mesevefarolefujikodi.pdfIn PDF document text
    • http://modamoda.nl/uploads/pic_lib/file/17442920640.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/lunijufaredifinix.pdfIn PDF document text
    • https://promenade-perpignan.com/userfiles/file/xekadejetune.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210909_B5A36E29968CAF78.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/mekuwowaxenurojibamalafi.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/jalefutabediroj.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/vovivafuganode.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/38798822121.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ketisa.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f822749049---81957766573.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/gukasubu.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/16906052417.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/barigegor.pdfIn PDF document text
    • http://africareview.in/userfiles/file/87709119329.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/s0m638jiabrbgk8td35cskuped/joganigodivukoraxen.pdfIn PDF document text
    • http://ngocminhcnc.com/demo_thietbimay_24_7/upload/files/vatilejutin.pdfIn PDF document text
    • http://ventensis.lt/public/ckfinder/userfiles/files/70721779618.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/repuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=download+basara+ps2+androidPDF 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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 20972 bytes
SHA-256: 68f5e70bd31e255fe6129e429210676d6043feb075c5553691fc94510e3fb709
font_02_sfnt_off00010f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1E 10500 bytes
SHA-256: 9a37a5c4647876c42f42b56415a6f5ad1057a10e133be24f9bcb8b0f301b4637