Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d28096025105f1d…

MALICIOUS

PDF

83.1 KB Created: 2021-08-21 21:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e6a02b6df321ef50e7708e848d08ca51 SHA-1: 9542d5a9bb1703da0b07520e014295b1ebee0292 SHA-256: 3d28096025105f1d755ff73ada2f2b99c2e07d3f70b0ce3bd97eed1d150190f3
156 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://lawrence-spruill.com/clients/42275/File/sabiko.pdf In PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113ff34e7469---gunoluxusinijipunij.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/zixekabowadetowakeganesi.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/xixujop.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6ad1ee103---63867228270.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cb5f009e8---23519890924.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768cc65f25c---fagenolakasoderujomelafex.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/kiwazesubeti.pdfIn PDF document text
    • http://banhangcongnghe.com/upload/FCK/file/1173696079.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/37e824618ca66f3ba4cc19cc8c529b60/40739163375.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/82039332039.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/gokexam.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b112c4203---6540530376.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/livofolol.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/3ecef78187f6a6319eb0ea10a28eeea7/kexosirir.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44b186fbf3---4986235960.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110d2aacf601---25731672057.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/ba3c906bf73792baac97a4637b1163d0/debakuxuzenezonog.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/26538699454.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/sigofu.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/juxuvuzajitanaweroles.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d0381be4485110ef57a1358d24d9182/60781456614.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/63144790835.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/d5b2de40643ccd4fce2fd1115860716d/zavafutifuxuretewemad.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/35987763882.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/50565786139.pdfIn PDF document text
    • https://aldapa.eus/files/galeria/files/fedumevesudimabekije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2+metodos+de+obtencion+de+alquinosPDF 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_off0000dd83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD83 10840 bytes
SHA-256: 6278b8e3bec9945af5af5d7b7f267ad103cd7cee2047ee5ada23bf80aaf6310c
font_01_sfnt_off0000f656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF656 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E68 17760 bytes
SHA-256: 0250bce0060dee57365afe96e929a0e848415c857a5507a72ed06ef22f2b3784