Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e837b854d115fa…

MALICIOUS

PDF

87.3 KB Created: 2021-09-03 01:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8b16ca76de5d0589763fc5c1614635ae SHA-1: e7935bef4e037702e54ad82a517fca81029b6c40 SHA-256: c1e837b854d115fab2164b0f3027b41e1908f4148e202253f224efaa296af1bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://natyabio.com/uploadfiles/tinoxogot.pdf In PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/nno03n1mfnn5thqeo448sde1od/xenoxewesam.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/jizofirivero.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/57534086908.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f7ae3f731---sotesavozunadekefawego.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/91109037136.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/tegigazulilinuvetifava.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/29032165064.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/feh595hmb4a0vhhn7v570vi151/59428503788.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/5b8aec4e2ee2a8214639d0c5f77b025d/sosazilunovifonexu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160729c1d74255---dudefumukogabe.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/94e8e54bc60b6c264a6066b57077673b/90285603495.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/22klr6m0pmdi8va3hh9o819r48/beritogizulesor.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/7953855873.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/m9pdko04fq686at93r70koa532/bedolijija.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/181646428.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/70174c28100089f831c67073df59b5b5/lilamusidune.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/55297797416.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086930693af4---rajagotonelizatubupim.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/7403cee371f8b5374a19ec7e49de017d/gunut.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/363f1f7aff31908456384dc1480ea8d6/31725631722.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723ad8e8207---53442903236.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/ketuxuxun.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/ko3oli7k1kdvsq075gtckgln36/tonidewelakikigofiruke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=carrier+air+conditioner+service+manualPDF 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_off0000f1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000109e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E4 10728 bytes
SHA-256: 42ca501ed2d1975bfa2af6d2255f16200b57468b47933169b82bc31803082562
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 17328 bytes
SHA-256: 50cb9edb64f788a52530612300c187b6e45fd84a6a8040492099cc6cbaad9cd2

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