Malicious PDF — malware analysis report

Static analysis result for SHA-256 23648c85bac22893…

MALICIOUS

PDF

73.9 KB Created: 2021-09-02 01:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7c88d64fc572540560d1942ae5da7dd SHA-1: b1cf6e5a150887f8086209696eac31d2e1d5959e SHA-256: 23648c85bac228932a20aff36c5fed5512266143e63b74f4d49fb0e7fc0d6ed9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm or redirection mechanism. The presence of embedded URLs and the nature of the heuristics indicate the PDF is likely used to direct users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://laborke.ru/uplcv?utm_term=the+machinery+of+freedom PDF link annotation
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/bb47f53277683e48febecb8fd10fe0bd/17551691618.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/6861d0d459affdb0c84776566e626846/15125786864.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915f010efb4---tutoz.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/38917158701.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/aaa7875de1018927bedab274b752fead/xegamusuvixeb.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4f2381df02481af1afb510d94a763228/43791627546.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/11454573548.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/fadabifafuv.pdfIn PDF document text
    • http://www.polni.si/Images/files/58521239892.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/07/202107312305117627.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/59d73c26e27b47c514b6b90f87938484/lopexu.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/2pnco4sma83q7tu93rgfkboeu7/davolutijesanitemunuxel.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/62586094676.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/635722933.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210715181711.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/f914741704ad24d4fb6f963d3ea67db7/nilaxosafesinufowugozoke.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/vupeporowiwezujavevip.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/0672422760fcfb19121f77f570421ecd/wufiganulevunudopav.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5bd313ce---97107563022.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/5cf229b2a4578ee719335145c4bc3a15/bajerijivekepux.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/88232054201.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kcktuag74q1c09cem1q4aqsmj7/gixuzivuwop.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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 16716 bytes
SHA-256: 8190a47bad741bec728c30a692f85fc104c810c39092da2739200ea9a89bcf9a
font_01_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 10504 bytes
SHA-256: 83bf092766b91be7909f5aad670dc984ee095ea22bd88ad44b60cce18471a1fe
font_02_sfnt_off00010193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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