Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05757048410441b…

MALICIOUS

PDF

86.0 KB Created: 2021-09-19 21:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7b9f7ae882f8f69b19d459cd05c97a8 SHA-1: 7c0ec171f2873014b0e556be99250b9249deba99 SHA-256: b05757048410441bf20900d1504cea7b222b4e634b6e2d59894433a8cc786c29
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://classicalgardenstatues.com/uplds/file/2083039479.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/lelufifosuza.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/b774fd1d0655684b4d354685c72aa60a/26963593004.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614241cda658d---16298620178.pdfIn PDF document text
    • http://devveb.net/userfiles/file/1784233667.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/97860801581.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/nitozeratiwejogurat.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/gogutafuruzifeviziga.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/xirilafuwotavi.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/jebodorufogezutilaleludi.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/87012885372.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/27002652239.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/wotexeva.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/98939248331.pdfIn PDF document text
    • https://zakarpattya-tour.com/upload/10930794697.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/mutizomelufofogam.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/50169332270.pdfIn PDF document text
    • https://krusomying.com/data/file/2474822154.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/nosomodegopu.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/tefalamefi.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/rikalipufa.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/nuvobejavemalidav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=facts+about+the+emergent+layer+of+the+rainforestPDF 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_off0000e90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 11116 bytes
SHA-256: 886dce57ee3fb8062e14d270811582cdba226f7712cb4fe0bc0faf7e4ac15c7f
font_02_sfnt_off00011ae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE2 17868 bytes
SHA-256: 7918322a4836fe8539ab2cf1df4c442ae9a70f345a88dd6041777d0debbd63b0