Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd524eb0c371043d…

MALICIOUS

PDF

91.0 KB Created: 2021-07-06 21:56:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a510dc270a23d2969e375c4e11c337ec SHA-1: 7e5b1f9eae78a11374d0b68c06a360e4592c4d9a SHA-256: dd524eb0c371043d5587729e09e8fc85c7efeaab3bf9f66149f1f0390da16da1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://huntic.ru/uplcv?utm_term=subcooling+and+superheating+in+refrigeration PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d331f9f0aa---xagivut.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bojewekuvojavulixovaj.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/davaguxodopevotu.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/3b01889db750bebb29a61c4248c723e1/gubevawub.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/18542301573.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/bijujowubizuv.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/89258924231.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2ef18222cc02b1e502a3f63ff2016dee/levopelitawomurosit.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/metatuverebo.pdfIn PDF document text
    • https://wasserentkalkung.at/ckfinder/userfiles/files/71651452012.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/d74ff57da8dcefbc43b03dc6d25b4e27/36325255476.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd082900d9---43478558510.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/jimodumabogak.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/1986217798.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1ad27b143---fonotipi.pdfIn PDF document text
    • https://bmat.mn/uploads/ckfinder/files/97935850022.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/463ca18dd1a80370b6e9778e360d1e77/23756497871.pdfIn PDF document text
    • https://amblamy.ee/upload/file/72161321055.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/xoxesitobow.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160714085c10c3---putonizijed.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb2142d0a2---dugegeg.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/gajikakozididajezarem.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_off00010126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 16756 bytes
SHA-256: 20e43ee103c0b7d07f2bbd0cbeda059d7185f770eae99581bd53cd42690237c0
font_01_sfnt_off00012cf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14507 11216 bytes
SHA-256: 636a8d9cb6cf259acf45bd1512e137c1b3013fc35f0cd4f5dd1326026d499ab1

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