Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ac67d365eb65c39…

MALICIOUS

PDF

91.6 KB Created: 2021-08-16 10:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 46fdd5ff382de1866d3bfe7a4a3cc96f SHA-1: 60051520e0e99bfbd43d2b584e0bc6848578595a SHA-256: 7ac67d365eb65c3982a7cd8eb9adab9f3350c8ced68fba6b7aae8537eef2774f
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external URIs and the PDF structure itself are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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://drafthe.ru/uplcv?utm_term=watch+madea%27s+one+big+happy+family+play+online+free PDF link annotation
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/da6ae96c339fd1aac14d32ed0b83bbd2/lamoxijutonowevudosisodo.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rtf7imnlnegqtru3suekl8884k/rafinesilukegasira.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/molojobesi.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861db160486---vodonakivuvuwakeseboku.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/732p7180ad6upsn1bfl9fvoahk/xudotubipamajajuv.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/27653453288.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748446b6bb7---xizejotupoz.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/xamudopevudirawolitugu.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/79901850041.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/zokajogeriwivafi.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/vijijunodujuwijowoxuja.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/sozeru.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/lemasinuzapefokakixero.pdfIn PDF document text
    • http://waypl.pl/upload/File/xenugeme.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/74446725434.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/92702275788.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16104e677bb5a6---gojujutafovomizake.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/pasawelo.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/rikanuvef.pdfIn PDF document text
    • http://berbun.com/user_img/file/xudugopeze.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/93950597200.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/73644698807.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bb1927b20---68380405642.pdfIn PDF document text
    • http://angelescare.com/userfiles/file/31599453704.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16079ec1a415f7---mumatakowaraj.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/pagekobipovasabusanigosas.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607465c49b4ac---wowulozomoput.pdfIn PDF document text
    • 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_off0000ff67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001177e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177E 11348 bytes
SHA-256: 69b503567812281204c8b3e5d127715a7c7ee26e5881aceb9b0ed44a040757ce
font_02_sfnt_off000131aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AA 17596 bytes
SHA-256: 606d2d05264391e1377d615337c894ed921a53ccd461da3ae16675019218475f