Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8c92d72f478f742…

MALICIOUS

PDF

101.2 KB Created: 2021-09-03 10:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5502ecbacdbf614393a2d0b0b55c0783 SHA-1: 72cdb36369c95d2561a9461bb09047e67c2bbe52 SHA-256: e8c92d72f478f742a109f09cb03b731c50861af6fa57064853adc33f91873aa8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs point towards a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://pistant.ru/uplcv?utm_term=1000+solved+problems+in+strength+of+materials+pdf PDF link annotation
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/s5r0uuh9ac8fk32s5ug3eptii2/pidanukafowep.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/93068867176.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/fudimusi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160babe0b4bf34---54442755329.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca57353614---11026860587.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/43830390339.pdfIn PDF document text
    • http://pi-consulting.ch/download/lusuzanitelasasawiwegi.pdfIn PDF document text
    • https://macronew.com/upload/files/mixoribaneremidexexojof.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607d80ad7c56d---duxunoxanumebokozofabesed.pdfIn PDF document text
    • http://rheumatology.institute/upload/content/file/59164981108.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1e360c6908fe1b6a8bbd6bde95f995ce/44731491379.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a446a5be6d7---titujixelubetodi.pdfIn PDF document text
    • http://holzbau-napetschnig.at/bejezadofurizu.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210525151024742228616.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a8178bfb---ragakojimotiruzowe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/1fe24c5aaf2f84a5a16a89830f008a14/pitave.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/88266009200.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/45911019530.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/54444531177.pdfIn PDF document text
    • http://lg-palette.com/upload/files/89287953514.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612cc063b8ae9---mosobuga.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/c377c3463e0042f11153946ce77f9a45/64475591965.pdfIn PDF document text
    • https://roomart.uz/ckfinder/userfiles/files/mubazilunurukax.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/63425804808.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_off00011c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C48 11228 bytes
SHA-256: ecd39c0e65d82dbb60939d5277137c6c49ce1e2d798ec9801a384018afdff2f7
font_01_sfnt_off000135f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F4 21460 bytes
SHA-256: 4a2678c1cf56816fa1869af4c3b322f337ad4d44275a0a9f172a0f37213125d2
font_02_sfnt_off00016eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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