Malicious PDF — malware analysis report

Static analysis result for SHA-256 5650d2c10b62f8f3…

MALICIOUS

PDF

86.5 KB Created: 2021-09-06 21:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 51b466c1f961ac0c5a5a87d1edd49cfa SHA-1: d88ecff87f9429405ad03560832a36163f427c42 SHA-256: 5650d2c10b62f8f34b5367c18ca8bab28fcc2f57caad8d43e0f86654185afcb1
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories, suggesting it's designed to exploit vulnerabilities or lure users into downloading further malicious content. The presence of embedded JavaScript points to potential exploitation or redirection mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/10d6269cc62ae99efc06ed14569576cc/80527083644.pdf In PDF document text
    • https://santechnikosdarbai.lt/images/files/66767483166.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/jegajijajutelikodezetasen.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/9be863ba18f7fed4a95a65882856cc44/nunixorumijase.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/3b657ac3af0de749e21bbc7cc6e7c2e3/45605952547.pdfIn PDF document text
    • http://superbarter.sk/media/file/11590450104.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/85046a4a236b83f95e6689e375d20f39/8193724811.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/0135e0344ccbc832f6c6c5268cf16516/zojib.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd60faf9a1---1491712756.pdfIn PDF document text
    • https://quaint-house.com/dirakazir.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6dae5883---94216233267.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1491502fe8---14096880340.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/rujewe.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/zozogopakojominusugijakuk.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612738d7b6fdc---77935140453.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/33154502023.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a278994f466---93317277036.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/nevolawimot.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a111aacda0e---80043633240.pdfIn PDF document text
    • https://agatanorek.com/files/file/24025369479.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/0e01f51e76a81f5c1c8f36e244f61222/bisusipapakelixek.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/43659e8e20c5f08d70312e0895cc8159/24241922743.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/fedevediwuwuxe.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/fajusikazerunonuxekekesu.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b6e5a36435---91139090675.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084077088399---55833411878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=microsoft+flow+sharepoint+manual+triggerPDF 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_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 18964 bytes
SHA-256: 75d1907343122995952c6ddd28a80ef8c749ba9129bfeac2c86414cce944aac1
font_01_sfnt_off000119e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131FF 11108 bytes
SHA-256: 8b1122bd2d85c1fe91d4ede303585807caa6b1066d74b2e39133ecd37da9f951

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