Malicious PDF — malware analysis report

Static analysis result for SHA-256 b876f055f6d5474e…

MALICIOUS

PDF

78.1 KB Created: 2021-08-02 05:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 111a574a2b1d06eeadd3faef12b41f09 SHA-1: def3f7be60af0d7d0b552f465ef2e176ba18ca4c SHA-256: b876f055f6d5474ee8ba00cf746b98cc54c5c29bf4ea02c77fdb4d50fe58cf10
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a737731c53a---nizujalivisidugatu.pdf In PDF document text
    • http://uctodane.cz/UserFiles/File/fafilivojokolara.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609c8c6de1c63---diladulamoxokemelexan.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/wugogo.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084bb51cd01b---balafukivumez.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e67aa9e5359---66183444739.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/tijivuzopawavibibivoj.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160aad5b254baf---kotekiziwuvifewiwotewup.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bakekowugakizilisox.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/b009243968829c8d2661d48f40d622b1/65522031179.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/29911967328.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fd6cb7d4---geletilafupuvusuf.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/vijamexomenusud.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/58647303061.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/j0g0d05gjpccrjnvmtr0jqrq16/74760324442.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/c0f7crsu787h63c120bo1svk8s/95377713548.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/mutizonidawav.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xipejig.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/tegunuwijifiwitobawolis.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/23037fdcb08a5d8fc509bb936558a448/93324685773.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/gixogimela.pdfPDF link annotation
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/mimevosekeratelipizun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=caddo+parish+jail+inmate+listPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/rosidabafe.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_off0000d0b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B6 16268 bytes
SHA-256: 3dde61f09655988e8d155fbcd17ded0ce6ba640bdb9be1cec6359aee223d956d
font_01_sfnt_off0000fa97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA97 10816 bytes
SHA-256: 5c7615803b092274e0820d4b4c0ff57d3f26e0c0cf7b100d4534b46d4e608931
font_02_sfnt_off00011348.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11348 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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