Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b74f30f8f428ca…

MALICIOUS

PDF

95.2 KB Created: 2021-09-17 15:46:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 84055632a21dc397d6f0eb54979210c0 SHA-1: 4185a0655b30719613b28e3d57eaa2ef63e36047 SHA-256: e0b74f30f8f428ca6e4a1130694f64e2cacac91bab283e4d6eb5ba449945feec
164 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, hosting numerous URLs on compromised websites, likely to redirect users to phishing sites or download further malware. An embedded JavaScript stream was also detected, suggesting the potential for client-side exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=the+importance+of+being+earnest+book+pdf PDF link annotation
    • http://educasters.co/ckfinder/userfiles/files/93245943239.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/55422373065.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614211e9358c9---12117293466.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161404634e50c7---61494451059.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/25130409894.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135ad4ecde06---soretekitolaxedo.pdfIn PDF document text
    • http://tipiland.net/upload/file/39555373728.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210907_CF68FE02504CC529.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/letidu.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/lijagitotowi.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/90507861099.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/83957685018.pdfIn PDF document text
    • http://hermanosgolbano.com/admin/fckeditor/editor/filemanager/connectors/phpfile/29590341377.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134915ae0f6b---17214119946.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/modufedo.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/40324900661.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/vazuxufiw.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142573b77fdd---pufegaxajefogewe.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20219497205413.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132dddedc6c8---73997104677.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/tevopunepisaf.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/93210185185.pdfIn PDF document text
    • http://musicpark-live.com/userfiles/file/87918511765.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/xelepuvupenuxaxofusaradi.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_off00010da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA9 11216 bytes
SHA-256: 010b24751dca467d1b5cbca44965b1a6f7c374a963e5ed095f6ba596863b0636
font_01_sfnt_off00012757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12757 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F69 18532 bytes
SHA-256: db6a80e0bb440742577048927c566e42d2f943e3e0170d918ac2886f23e34e0b

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