Malicious PDF — malware analysis report

Static analysis result for SHA-256 f528b84f1d63990b…

MALICIOUS

PDF

80.3 KB Created: 2021-09-02 17:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8527e187d1852823a6dcf73709b338b4 SHA-1: f123451f4a682e3966182c63706c1a75ed33e6af SHA-256: f528b84f1d63990bf79af0b7d4e1308be1f7f3d2c80faec2fc1eaab094dd3ce7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and links to compromised CMS upload storage, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=crock-pot+5l+saut%C3%A9+slow+cooker+manual PDF link annotation
    • http://ztkammer.at/uploads/file/gerivudijavumolud.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/gelufofig.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d57ccf4a7---69940383334.pdfIn PDF document text
    • http://balone.net/_upload/file///77465398492.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6592ba88ae---natarokedawexe.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/talizomusaduz.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/tigifusuvijajule.pdfIn PDF document text
    • http://51www.org/uploadfile/file/dc5d89c23136e8e892005165b3d51f2f.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/kazuzunuviweda.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/5kdtg40ug9a7rlkidqbcbmi2ki/95829990844.pdfIn PDF document text
    • http://gabinetortodontyczny.eu/userfiles/file/dozazubabuvodujixe.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4a28654a---xugakapaduvolininerate.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d54818d664---sobajovunazuxafikajox.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/6045084786.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073729f48e28---2444504919.pdfIn PDF document text
    • http://accronline.com/userfiles/file/kusaganofozudasadumujalu.pdfIn PDF document text
    • http://htcable.cn/d/files/sofisibamuxefiveguvoxol.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/xazuwijakikako.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/101e06999a632c71e8c29b164fd32e73/18318052470.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609eef8dd2399---67832004525.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084a22302882---83562245273.pdfIn PDF document text
    • http://someteme.com/archivos/_20210624040106.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd809f5e6e5---1977904105.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/29698010076.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/33246547001.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_off0000d0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0B1 11076 bytes
SHA-256: 3309fc1993fe9e0b6cbb89434558955cd79949b8262ef5e1b0686d16e75ef3b5
font_01_sfnt_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001027c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027C 17996 bytes
SHA-256: c75655ec77b186b0a39c19d9b11841e83cddbd054f90cc4450e228c352194c5e

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