Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52b45ba7b098283…

MALICIOUS

PDF

80.9 KB Created: 2021-09-04 11:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84411ca48154cbe6ae461e401ad97447 SHA-1: efba565c11987cbc06d35bfc1c7aac637051678a SHA-256: f52b45ba7b0982837671eca34f13589186f2f64288ecaccbf4da3677a894d130
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable domains, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be directing users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sevinctekstil.com/resimler/files/ribagudiragag.pdf In PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210708_DA5CAE1F32071AB7.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8fau910js6ocn89622ojlrp621/xagumozimulo.pdfIn PDF document text
    • http://lowry-averyreunion.com/clients/c/c0/c0e4e7922159a76f956c19110b7bfeb7/File/8002842790.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c77a84ab14---taresokazam.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/gopuwejetagarufoselojot.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732517db710---545807300.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f69cfe9237e---55630848399.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/lemejoduziwowa.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/wubozipoba.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/71853119393.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/rarujefonodapokuvu.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/76592953649.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/sapiwamis.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/74562083372.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/nawitixaxelataneduwaloso.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/20fab0e4ded238bfd9f1098b92b7e823/37420374088.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/kapezirigibosanawimewaju.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/bcf11b9f39e2081238679aa8fc6ca8b6/5136400815.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d527df3be1d---wizamuperiturobulevuzov.pdfIn PDF document text
    • https://badrivishal.com/media/semopofavexedigesajot.pdfIn PDF document text
    • http://cichanski.com/Upload/file/zaxefowasitidokage.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/momitedenipa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084a3cd8c7f8---biruxefarirowerudupa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/49456741916.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/82d500a4ac58bce4c25a091568c45471/butafome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cara+menggabungkan+file+pdf+jadi+satu+filePDF 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_off0000d911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD911 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF123 16528 bytes
SHA-256: d91c922f1b46a07b42af134ea45370dd914aaa1105a34b2087d7c273320cba6d
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 11216 bytes
SHA-256: 288f443bd8ee7662c24ec671d0292d031356d1f9cb4f717ee89626857c2f277e

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