Malicious PDF — malware analysis report

Static analysis result for SHA-256 3379612fbe5d4fa2…

MALICIOUS

PDF

83.0 KB Created: 2021-09-05 00:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1cf925b1334c0e674ad52dfb0dd42794 SHA-1: c1e14f79dd44e6849f718442fc55932cdc7b2a22 SHA-256: 3379612fbe5d4fa271d48e866f0355e0c207f7f7bd162ba534c1c7193a654627
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs pointing to various domains, many of which are associated with 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. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://infrive.ru/uplcv?utm_term=ankylosing+spondylitis+exercise+program+pdf PDF link annotation
    • http://petersonspann.com/clients/3/32/32c4b2f41fa698b5b938e848169c8dcb/File/jubirerukozijefakakulo.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/40044117805.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/35488834794.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2fea14d84---2157324629.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gokejibotovareladoruj.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/zovemoxogituvasidaruforav.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092f7674e5eb---56501251047.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/68448629019.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aacb3198a09---vozarug.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/40743420389.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/a06e9d101e1be0fd4dbcc194e2a66cb9/pakamulevawosalapubamul.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160872abb1e8cb---dobeluwasomezipole.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/78504163608.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/nsa3etu816gph4h6rjdjk7h8qd/36999212352.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/foxepapozabubis.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607866c5c172a---guzadowumad.pdfPDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba82eb180a7---zozodosutu.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609012904eb25---36774595969.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab50ae2cae2---91586217605.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ed9f18ad3718569ddff5c37ceca8614c/63768229225.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/33157966603.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/logodosevunal.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/foxuredokukod.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080319122447.pdfIn PDF document text
    • http://michellenevinracing.com/FCKeditor/file/23243489908.pdfIn PDF document text
    • https://etadelloro.it/images/file/kesizakopadugixona.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_off0000deaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAA 11252 bytes
SHA-256: 4cf120c6b91d89a2d503cd503e9a44409f7d85315d9c78f40506711f9cc22c84
font_01_sfnt_off0000f8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 17488 bytes
SHA-256: 0e729f61f2f71fabf2c80c2799996cce474fe435d8f1e9fa69640c9eb51bd6c2
font_02_sfnt_off000125de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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