Malicious PDF — malware analysis report

Static analysis result for SHA-256 56924a1d6281763e…

MALICIOUS

PDF

68.6 KB Created: 2021-10-03 08:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0226c9ecdb45ee6c59792da63f738565 SHA-1: 734aac66a70a535920dc721c1f8910b442e6a228 SHA-256: 56924a1d6281763e9a42b106e96841e622fbfcdbc4ce5ad4d19597fefad5dba7
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicate high maliciousness. It functions as a link farm, with numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The primary purpose seems to be directing users to external, potentially malicious content, rather than containing an active exploit within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7b84a32a300952f40679a7b76c26697a/20861643090.pdf In PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161446b2d115c3---64970652698.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/51850364332.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1dd1db44e---piliz.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/davisademopisomataz.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1614fce38b498c---magogukavafidureke.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/53826144014.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/gixutimilo.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/bogifonine.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d73a1ac24---tatof.pdfIn PDF document text
    • http://gibisch.org/files/files/sisibomamalagesigenivokis.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/fonik.pdfIn PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/xutabomomidibalino.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210903055427.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/kofanizemafetagidakomejof.pdfIn PDF document text
    • https://foulardfotografando.it/file/xunekopotobudegedijik.pdfIn PDF document text
    • http://stroytehcentr.ru/images/file/89660531801.pdfIn PDF document text
    • http://astmasme.com/userData/board/file/2897576507.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/lapuvipekik.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/doguboduputoxivatawolid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=psychology+in+your+life+3rd+edition+free+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_off0000aced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACED 15248 bytes
SHA-256: 8010142d40a558549fe5929d1945de98a579a52cd71a168a898e4c0cb9cf9e0b
font_01_sfnt_off0000d332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD332 11124 bytes
SHA-256: 5132a85600a1d36336ea4581ddd50dd34c0f5fea71575c78b843c2296315d650
font_02_sfnt_off0000ecfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1