Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a13121b79338b90…

MALICIOUS

PDF

86.5 KB Created: 2021-07-14 07:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c6bfd265dc695985d79ac7f6061868b1 SHA-1: e32e28d14581c727f7500cfbe944b8178e4310b7 SHA-256: 7a13121b79338b90970c9b9b17e4b874839b48a6e030ad1e8ef1e9ac8fc946de
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload storage, suggesting a link farm designed to host malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading malware via deceptive links. The presence of a visual download button further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160da4da6163b5---naweginiritotufapa.pdf In PDF document text
    • http://studiomanzetti.it/userfiles/files/99363787863.pdfIn PDF document text
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/53507010072.pdfIn PDF document text
    • http://ndt-ultratech.com/files/87254930029.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/77279483016.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608762e94d32c---51807205550.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/33278da3240ff010d9419c072bf20cd4/rinelunutatolorebat.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/mfstsmk8dgeaitkkcu8jgp71hg/modezadafi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084d3e3cc7b2---31426489520.pdfIn PDF document text
    • http://954move.com/clients/4890/File/74060171060.pdfIn PDF document text
    • https://botorka.ro/userfiles/file/80870689280.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/jonakozodavuzovawijin.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/367e6a2ad0d627e791b2154c36dfdae7/458243050.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a98ac8d9e9---76854855000.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/8dd5c611978baeaad272ff20487da871/bolulurabafujexezutavudog.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/taredirilirubukurewimasu.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/2990d76e23482d83a1b2705b428579a7/20717436212.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74bccc67c3---ruxilexexepuromeda.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/zenorime.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/dabixafigilako.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/c9a2ee91d66cca6ccf0c2343702b27e6/92395220455.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/31332296481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+gta+5+for+android+full+apk+free+without+verification+realPDF 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_off0000eaab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 11212 bytes
SHA-256: a558cb5304809d3b52cd4058e905638dce27e0f040a457305779c80496f707a0
font_02_sfnt_off00011cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD7 17256 bytes
SHA-256: 09fe4b0df6593ac858cb0d22c7aba839be09384cf997588033777cdfa7200c85