Malicious PDF — malware analysis report

Static analysis result for SHA-256 625f4daa756036e1…

MALICIOUS

PDF

75.9 KB Created: 2021-06-30 08:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ef761695a7defb0ed0df1fcbe21f3f1e SHA-1: c69b6022b4e1de51adf6327b23418f39c7094bc8 SHA-256: 625f4daa756036e10082e62e8897b8213a1839d6e8efbcb4ca1c4db1260a7f86
156 Risk Score

Malware Insights

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

The file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting. The PDF contains numerous embedded URLs, many of which are unknown or lead to potentially malicious content, suggesting a phishing or malware distribution attempt. The primary attack vector is likely Spearphishing Attachment, leading to exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://shosholoza.de/file/95694492105.pdf In PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3c1aca78b---19086158900.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/mutuzo.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/20491930280.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0b5cd4965---59429863011.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/8oae6aen7vier8omnfsgd9u3f5/44964429271.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/1658674013.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/nipesatezanuwafemavituk.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/29621348491.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/40809724513.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nikamokewikoliwuv.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0576476088---livoxogowatozewiruk.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609417b6cda24---88156237675.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/76462907781.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e947f8fc18---85318011809.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/06a6d10eda950abbbcd5ae747268d007/58926048925.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/wubiz.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16084aba8e92fe---vikobe.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076afcad1c19---peforuwufokoz.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/dd8d98cd13039fe96de2bf8a05bf4f51/nutapid.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160742a139a853---wijudojubibi.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/0b379179d1cec37168ef6b19ef812935/kigadonanufelawosubidok.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/78635f030e24ab3c3f1145d9760aed49/giwafire.pdfIn PDF document text
    • https://aashianarealty.com/file/47790089814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=hypertension+is+a+condition+in+whichPDF 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_off0000c5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F0 10756 bytes
SHA-256: 19b55c1ddcb1da656565486ad23a7b8ab6fbffa75cb9c0a2b4ea10669bc3eef7
font_01_sfnt_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BD 16832 bytes
SHA-256: 0916ad9af360f99248546578959ade8db78b998d65ba02835289df86ffcbeefc

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