Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5cff9956f8802f0…

MALICIOUS

PDF

82.0 KB Created: 2021-08-24 18:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ae61900188fde8e4190499e519ab7ee SHA-1: 33bc167e5a4b20e2327555a4ae2bcd8c2eda1106 SHA-256: f5cff9956f8802f0801c0c1e9107cfa56898948efe3da4f4ea5eaa8f1b542838
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or attempting social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/6u90ssb7kq0792j42rppvaonj2/xikufixejukuluwapa.pdf In PDF document text
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/69273368994.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160748e35d892f---69116727671.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607305e100a4e---32474040759.pdfIn PDF document text
    • https://mo-space.space/web/img/podborky/files/zidinefosoliga.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4fd52c6fb9a186b538895e8f2b0fdea6/89458102923.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/g3kmcq8uof3juotgglgm7nfdn4/minonewunif.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/73251401698.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a85be33f2---lidebivibemekoj.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/pebizupan.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/mlhsi46vgbddju321uqeuarmel/17504494710.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7549e86448017de0ba942cba3f5241aa/bofikekosevolimudod.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/sujobajen.pdfIn PDF document text
    • https://mcrlclient.com/ckfinder/userfiles/files/pinimizokajabupavajifita.pdfIn PDF document text
    • https://wita.lt/images/files/63200951281.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4dcd88506---4347611118.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/045c8319790d5a649565169717cd47e4/70136181575.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/30074170345.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/mawaxodividuzuzoso.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/xukit.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/72706808786.pdfIn PDF document text
    • http://zamgph.com/uploads/file/242137183180.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838d5ec2d8c---5376239533.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e70127ca89---fojuf.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/020009152685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=web+for+facultyPDF link annotation
    • 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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A4 10312 bytes
SHA-256: 9774ce7a231840c0d68dedc038fe97391d88de67e75014083e2f88c08af30eaf
font_02_sfnt_off00010c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 17748 bytes
SHA-256: 2324464aad9836c74ba340e81e08ee60a06f971b41a0b20865c9d90bd0502f7a

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