Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c56d02fc6f4426…

MALICIOUS

PDF

78.1 KB Created: 2021-09-01 00:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9d863e445c854134e756c2a0fb26123 SHA-1: 112868a1166ca82cfed10e85b30259a80ea2e68a SHA-256: f7c56d02fc6f4426f7f363b99257ff19fe1c8fca21089ce8c1d005c6f065be0c
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised CMS uploads. These links are likely intended to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a065f70e0cd---65383139567.pdf In PDF document text
    • http://autosklo.sk/pictures/file/gopuwumo.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/21950292317.pdfIn PDF document text
    • https://atlantidegattico.it/file/6247811124.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/29eb63b757020176d97a1677ec4a8d56/90052992771.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/xikiropanikakajimupo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/vuxutozebojewopuvatuko.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/37420934762.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/44021904557.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/xorawew.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6i26o4qoaos6b4e3opi1rdql63/dojakurotenotatotadavi.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/mijoravonepevotev.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7nedt0lk1l26mii6tfr21r5f13/didodi.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/74786290990.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/vofajexukotexusetafaso.pdfIn PDF document text
    • https://blokhol.com/upload/files/vuxapo.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a8c121db1---xejofuju.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16119427315c04---16691575202.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eef4e1bdca---fowuribikebaxaza.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/50834230455.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/nobas.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/01aec188a63f5064fb96acc79a3ecb1b/65584697642.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/c231a676d92b177fed02778e20324c88/32371091193.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/kolufejisesikekigeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dilwale+full+movie+subtitle+englishPDF 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_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 17276 bytes
SHA-256: 666bb248956a5e93fc72aed54d61a39ff1c6bd7149c3fa0ca3a610a35d7dba30
font_01_sfnt_off0000f8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11104 10952 bytes
SHA-256: 67099b34869cd94f52723dd6b31c359c136b25f0fa93c2c504c805f77586cbd4

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