Malicious PDF — malware analysis report

Static analysis result for SHA-256 27332dfa69b08488…

MALICIOUS

PDF

81.1 KB Created: 2021-09-03 09:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c30e509221a8b05acb45c64c31b6bd0c SHA-1: 66065edbc127ed3ec18977fd04f657fc3dcb5041 SHA-256: 27332dfa69b084887d523ef113fc7e13248f69f16f6d429f66e7a8df42ba3208
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=goodman+gas+furnace+parts+manual PDF link annotation
    • http://a899.net/userfiles/file/18199881035.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c62b1e573---lapibufijanavefaw.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/wovepasuforukosono.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/8ba1da6329e42a7977c42972692f4925/16332959439.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/salerudatad.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/oe8jl7jcsq47tq1mdqonh44gk2/xumobutinijapiloda.pdfIn PDF document text
    • http://jagdrevier.hu/upload/images/file/36939317946.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/bepamejiw.pdfIn PDF document text
    • http://goodslib.com/userfiles/files/fakomukugirepa.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zelewatarokirajuzonog.pdfIn PDF document text
    • http://brlairport.com/images/file/naxemux.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608305b9a718c---rumotonilotosi.pdfIn PDF document text
    • https://triangle-electronics.com/assets/userfiles/file/5778469531.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/76978304093.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/8337676d34c71f584a933cb1f26a2993/62393788196.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/rugibosuxotimokolubavusiv.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a0376f62533---46315102415.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/25333446050.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/beboboximap.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/6pv8bumqibak84akspqhc8gss3/sedevodif.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a11470ea80f---rotajajafifibifo.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/tamuburusizif.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_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 17824 bytes
SHA-256: 645da171c285ca55d2da6effab8dc52c91425b598e117fbc1aeaaed6b592378b
font_01_sfnt_off000105b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCC 11012 bytes
SHA-256: 09dfe4f72bbc77223d3919ea21b3c7a6c711fd2d5556d32c304091ed003f1f1f

Open this report in the interactive analyzer, or submit your own file for analysis.