Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecdd547d04c132d6…

MALICIOUS

PDF

79.6 KB Created: 2021-09-23 14:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 109ec6c879903c64517d735096b56f2a SHA-1: 46b65a18e7e6b843f6ddcf39706bccb4b9f536e0 SHA-256: ecdd547d04c132d6e9a221dcc9cb31aa859186eb4aa7feb75b2f5185be3262a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://drafthe.ru/uplcv?utm_term=leg+press+calf+extension PDF link annotation
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf959b311---66237980164.pdfIn PDF document text
    • https://campermagazine.tv/public/file/7570922779.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/94119215948.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e95325525---33596044612.pdfIn PDF document text
    • http://vtaky.sk/media/file/33825592287.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/31609894634.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/dobosi.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/gefuxisonigugijax.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090223460473499.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/30351028555.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/97141185129.pdfIn PDF document text
    • https://nvsrolko.org/ckfinder/userfiles/files/jadefedunajalidid.pdfIn PDF document text
    • http://pololanna.com/user_img/files/14506641514.pdfIn PDF document text
    • http://hoangle.vn/uploads/userfiles/file/23841086347.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/68621080984.pdfIn PDF document text
    • http://meteoratourismactivities.com/files/files/revuviweberoxe.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/dalunalojeg.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/94480708455.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/68757201798.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rewex.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/92823461183.pdfIn PDF document text
    • http://ruihuitax.com/files/file/fuwodeduzunekudi.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lg9pol90j3jusvr0ct8m0n51e1/wudovomarutovokeji.pdfIn PDF document text
    • http://guowangcable.com/d/files/xiwemitazapobatig.pdfIn PDF document text
    • 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_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 10712 bytes
SHA-256: 5b1110d6ae12a695195def151bede7c06ea20aa9e45f6778a765c41ea2572c3e
font_01_sfnt_off0000ebf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 17280 bytes
SHA-256: 1f46542e65a8c0f65df7c4732315dade0489053cdbcd4f16640baa7046dbb405