Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b726233fd09ac63…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 11:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc44f64c431479b2b5295306d46374e5 SHA-1: c21da2db9ba762e2621737c43adb191fe393a84f SHA-256: 8b726233fd09ac63716521199ab000f323d2d1165c3e95d32d443f7031fcec1a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of external URI heuristics and link farm indicators suggests the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://medvor.ru/uplcv?utm_term=pokemon+emerald+gba+emulator
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/17085737400.pdf
    • http://tecniagua.es/uploads/ckfinder/files/jaxav.pdf
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/33309945665.pdf
    • https://s-serviss.lv/userfiles/file/96337994445.pdf
    • http://bhttourist.com/upload/fckimagesfile/toveburinifosejusakifoda.pdf
    • http://top-caster.com/userfiles/file/wogorupuvizozi.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/349b817826b8fada6df84fd0fea38cd6/jakex.pdf
    • http://onthebroadway.com/CPD/adminpanel/upload/file/wewibexusumetidadokujufif.pdf
    • https://rarahil.org.np/ckfinder/userfiles/files/devatufo.pdf
    • http://ricettebiagi.it/uploads/assets/file/86311946148.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/falefebotexuj.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c47de601ed---76266033006.pdf
    • https://bahispesinde.com/gnc/veri/_files/65589636314.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151d8eb5fd05---misiwewetumoxuxo.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/92338569923.pdf
    • http://kientrucphatloc.com/upload/files/salibakuroxuvabolawu.pdf
    • http://cokhixnktientien.com/Images_upload/files/goseminagizefibina.pdf
    • http://xinyaoqiye.com/upload_fck/file/2021-9-28/20210928003036451630.pdf
    • http://www.taxivanclass.com/uploads/ckfinder/files/pewezozisowu.pdf
    • http://vantaidongsaigon.com/uploads/files/20606363271.pdf
    • https://alshuka.ps/ckfinder/userfiles/files/8276399407.pdf
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210901_01DDDD5626771309.pdf
    • https://libertyrealestate.in/ckfinder/userfiles/files/78496832520.pdf
    • https://icon-studios.com/userfiles/file/90452415230.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_off0000b371.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 16792 bytes
font_01_sfnt_off0000cb83.bin
bd98721ecd4bed1c058cda03fd19c7f4d9a1e225e50a8fdcfb821232d1ba7f90
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB83 17056 bytes
font_02_sfnt_off0000f75b.bin
8920bf264313725f2224987dcde160b4dcdc021b39fdd19ad557f05312c2f44f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF75B 10664 bytes