Malicious PDF — malware analysis report

Static analysis result for SHA-256 362f763d1c491851…

MALICIOUS

PDF

80.2 KB Created: 2021-09-03 22:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3cd79a6c653881f95409414bcd0f33e9 SHA-1: b8f83b95e7e4d554fba0ee59b6f77bb9695a2660 SHA-256: 362f763d1c491851de3368c2d731a18e49f4e02ab55a593de8b883a911c00d7b
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating it likely contains malicious content or exploits. The heuristics reveal it functions as a link farm, distributing links across multiple compromised CMS uploads and disposable domains. This pattern is commonly used to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://ktcz.eu/files/files/47307878421.pdf In PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/p07jqnqskjgsgr660m6um5ka1a/jilodapis.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/larulewezitasepefiku.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16081767dc0bc0---bepikaxidepatuge.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/3198996500.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/81744349570.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612001e5b25eb---19865006659.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/20894470199.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/15076040499.pdfIn PDF document text
    • http://alothongtin.com/upload/FCK/file/mebuzaxetubovu.pdfIn PDF document text
    • https://12shio2.com/contents//files/68628121695.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/92769304328.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607874b9bf408---sifumiguzopibojedefi.pdfIn PDF document text
    • https://osakadentalcare.com/contents//files/lipemon.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/30338979835.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/dafanafapis.pdfIn PDF document text
    • http://smakbyala.com/ckfinder/userfiles/files/pugenumanoxamoderonawig.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7b7fb20e6f375a9442e15bb6e7ac9165/63477587899.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/33b70e30273a73495451d414501d6daf/29250691437.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/79164741298.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/20707872612.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/0d11aiptfcvnp38htrfr9990qo/kufavuri.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/57548578761.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce80eda4c3---8676194154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=convertir+archivos+dwg+a+pdf+gratis+en+espa%C3%B1olPDF 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_off0000d1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E9 11288 bytes
SHA-256: d773f1e17eac6945999b072d58883aa752bdfeb1de6baa6dacbc23ae05aece91
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 17044 bytes
SHA-256: eb3a14586fd9974122712d614ad3b8dd57621a10e051aaa1fa8ace9e1eeb84a9

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