Malicious PDF — malware analysis report

Static analysis result for SHA-256 87639b60126a95ab…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 05:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e62d5af0ac5e9170aaebe70fdac3b7a4 SHA-1: c51ce3fdd307b31f7b45b96730d4b51cc493c938 SHA-256: 87639b60126a95ab2757abd55b4bd21dc5ee1dba6b24725ac8c4a9e206ea2906
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://lapalettedesarts.fr/gestion/file/5191752369.pdf In PDF document text
    • https://csn-alliance.com/data/files/3944605242.pdfIn PDF document text
    • http://andrewsexes.org/clients/867461/File/50333618958.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867a850ae---44140197391.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/subelanofororuzup.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a6714f460---juwefojijabemezu.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/9384685168.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/10867263183.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/21214407148.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/badilibuzujipunivawoxinu.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16100da316821c---14579134531.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d0c9dec0d8ad7b063519c967dbb9de10/57309140859.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/lobilulum.pdfIn PDF document text
    • https://dm288.rs/slicice/file/18583087763.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/zigifugisufagose.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/41868178706.pdfIn PDF document text
    • https://digireg.it/upload/1063123084.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/54239021126.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/bulaxiruveturiwo.pdfIn PDF document text
    • https://home-consult.lu/userfiles/files/15833579792.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/duwugepodovirupepepezabo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/67447701ed5b1621b9e695d16500d5a5/13936945967.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/wuxubafepuzirusobog.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/86444098510.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1606f532488cfa---62097863548.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16092eebd64c06---tovulefuzosidimatinome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=retail+marketing+introduction+pdfPDF 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_off0000de51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF663 17944 bytes
SHA-256: f160c6007dfe2f8a70561b8e694506e552d0526641dfbaa0688946b3be46e2b5
font_02_sfnt_off00012397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12397 11032 bytes
SHA-256: 54e215c85d1774d484095d74d7b6d668a3f0cef0bf41ffd45e634dee1f771335