Malicious PDF — malware analysis report

Static analysis result for SHA-256 61fd6d717fe34f32…

MALICIOUS

PDF

92.9 KB Created: 2021-07-09 07:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dbaa2e4ea291494530986187ac705574 SHA-1: f8a7bb3b096495f4d67c4f40ace593fec74f2259 SHA-256: 61fd6d717fe34f32370079c3d387302b8324dfe638e1c75877b0980909f97329
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to drive traffic or distribute malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially compromised, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a358ce85df---81800445117.pdf In PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f9b8836075a624428a5ff56b6f357381/36164119116.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/84080792746.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/jefuxijesusasumagu.pdfIn PDF document text
    • http://connect-senior.ch/uploades/userfiles/file/95199142467.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3f008519f---66799539322.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/notudaliv.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/regalawile.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/8674725b016189672422977807ea5e96/57939145496.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/9afa35b04fe2d8867454f37221f00b58/lupum.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609a039eee9b8---83033307715.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/xedutazipogifororin.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/18046754494.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/lorubajut.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/36c573afc70175355c1e40afb7743309/vogirevowil.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/di8lpj9f8psvfkco3vtdfpdbmb/mazazavel.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/9dabbfbf8ece3296f355791ef3abc963/falawavewuxi.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/24909160710.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///xajukunagaxariloxokuxemi.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/13569909674.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/88345415195.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0cb30af2431411f4a68ad51eabac8ec5/pepiratupelilinuke.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d474fe8bfe---tukakew.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/6594077717.pdfIn PDF document text
    • http://labcoop-jsc.com/wp-content/plugins/super-forms/uploads/php/files/ptg9ekao0s9v01kk6lrplgv70q/kixuxukaturoratixotezog.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/bazerifepozibanukamu.pdfIn PDF document text
    • https://bevelec.com/bevelec/dossierMois/file/dalerutivuwavalojasi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/bfac63abdaa5f7ad5965380f9c2750fc/45618739474.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=russo+computer+labPDF 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_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 18568 bytes
SHA-256: fe10c859a8856960c939c5cd8b66fa585c4f250589d1f53270dd8ae7dd8be25a
font_01_sfnt_off000135ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135ED 10624 bytes
SHA-256: 94cd7dd312d21b5d6dfe378bb3304e074cf19fff13b5d98f92c15f00f36b65a0
font_02_sfnt_off00014e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1