Malicious PDF — malware analysis report

Static analysis result for SHA-256 496559711b985951…

MALICIOUS

PDF

82.3 KB Created: 2021-09-13 11:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 502b22d2c200f231a89b1b643be93151 SHA-1: d92d396dd5a95124b7ebc38494c934fe646e93fd SHA-256: 496559711b985951c08830c256cdd84066f40f089a1c8d81b8b888f27990c72d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised CMS uploads. ClamAV and ML classifiers strongly indicate malicious content, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://infrive.ru/uplcv?utm_term=jw+mod+apk PDF link annotation
    • https://aslplastic.com/ckfinder/userfiles/files/sebadujivubefom.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/gfmnnl20mnmt2i6mn0bhvj2b52/pabokureto.pdfIn PDF document text
    • http://maconlux.lu/userfiles/files/mesijudipogobi.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/98957230244.pdfIn PDF document text
    • http://harringtonassociateslaw.com/Test/JabzMedicalBillingService/userfiles/file/niguxivajaju.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kifarofusetunil.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/6823911091.pdfIn PDF document text
    • https://ratodua.com/contents/files/19701580527.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/pabojezuwaborefonire.pdfIn PDF document text
    • http://chongthamphucthang.com/images/news/files/76697563685.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/m2ucdp3refv3fcl9ljqf8ftm6n/69786588517.pdfIn PDF document text
    • http://sourceit.ke/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/28344710837.pdfIn PDF document text
    • https://debden.org/userfiles/file/In PDF document text
    • http://portalpr-b2b.es/img/user//file/_0926232001631369060.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/xijozesadasifizavobux.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/3iuil2vf8umae0jbl92i0gmj5m/13771313473.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/tesifelexaneridut.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/18727644400.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161319e6add935---34067071938.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/22636930420.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86685773337.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/ravidemifalu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161391896d3825---9954160481.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/80022093254.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_off0000dbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 19084 bytes
SHA-256: 59fa1ae987cab7906bd1d89c804ba3fd9a826aa3075bef6e8101b629268c2f74
font_01_sfnt_off00010def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 9984 bytes
SHA-256: 2837c6012ee4f7c23c98b35da188cf50e401ad3d7e407dcc6a530ccb221bae32
font_02_sfnt_off00012415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1