Malicious PDF — malware analysis report

Static analysis result for SHA-256 102d5078726784ed…

MALICIOUS

PDF

92.2 KB Created: 2021-07-21 23:03:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1ba80443f36d244df09b6724988dd97d SHA-1: 94822d940b915d38e425b37796ad4402a3ae5cb0 SHA-256: 102d5078726784edc8bf0d081c20ad373b9bb974433c7870b75ad78f49add4b0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160914c902cbf6---97894910007.pdf In PDF document text
    • http://buergerforum-tirol.at/file/93487843698.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/96406129167.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/892d7cd4e75925facdb0cd4525c60690/1684336605.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/53283394719.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/ginavip.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/74958957744.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b472315a138---31799104355.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810b55a2f93---77992267897.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xazegewananusorupek.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f4681412cab---bovoguradezofos.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b392f17d0b---nusefirewegidikupe.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf1d94a678---zuliko.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/74672435508.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/vizutovelagejur.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/5cbbb672cde7ec49e64a7c82f9d7dca9/17218608968.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/jabamebe.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/4aa6e712ad60d17851c2fb775c08d3ec/93085454775.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/kibadad.pdfIn PDF document text
    • https://fasaac.org/temp//files/93224954445.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/gilamigizabazizibifeji.pdfIn PDF document text
    • http://ogbchurch.com/clients/880797/File/bidiwavutu.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/eeup2vjq0vqeer2o83g128sr6e/24949097350.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/72084195483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=after+we+collided+hardin+and+tessaPDF 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_off0001042b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042B 10640 bytes
SHA-256: b90536d4256baa53f71cc9e2d7f0a69e8a1c4bfe5ceaef198163553bc0a61e9c
font_01_sfnt_off00011c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8A 17420 bytes
SHA-256: 7a080579119b77a91519cc7c50c754f0c53efb63a4033b47d527889c48e14758
font_02_sfnt_off00014a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1