Malicious PDF — malware analysis report

Static analysis result for SHA-256 39bac2ccf5087082…

MALICIOUS

PDF

77.8 KB Created: 2021-08-14 04:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66613155bb05aea0fad39dd937081202 SHA-1: 9fa855fdc77468313d03fed19ccae29b86a56766 SHA-256: 39bac2ccf5087082c71bcdd471e8da86fab7c9f07c053cc5022d63bc4ff4b0b0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple disposable hosting sites, likely for phishing or SEO manipulation. While no scripts were extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160942c67c2f20---vodogisona.pdf In PDF document text
    • https://dineflon.com//files/gudasilaxitezukuwavel.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/84854880123.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/15387268549.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/40944692286.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/86876621432.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6fb25a707634d5bb928b9fd28f863023/12063480227.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160784d5a8ea91---16460398140.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/wapekosikixe.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6621e31a3---92440605380.pdfIn PDF document text
    • https://5uempat.com/contents//files/pukibutere.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87fab0ff6---32763512279.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/wejozivabitufobukoba.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/42990513173.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/dodopusomejuxewetonubareb.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/15656556716.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/lasijubisexir.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080c77e5d2bd---5161349730.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/wogunomineruvotexurir.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/94461211049.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/12509910874.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+bypass+safety+sensors+on+genie+garage+door+openerPDF 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_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BD 16056 bytes
SHA-256: f14e4adb8b25a78085cb780dca99eb949fa44658cecfbe7de7b87839007eaf16
font_02_sfnt_off00010d51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D51 10960 bytes
SHA-256: 3c1a827608a5fa44d4ade9a19d983c3b13fa99334b90a60cdf777841936a9024