Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21616226e218a23…

MALICIOUS

PDF

89.3 KB Created: 2021-09-18 03:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b2ea028f2be51c2042489f1bb9f77ee SHA-1: 541885c2013859ceb84aae62e845e5ecaefb0f12 SHA-256: f21616226e218a235cec80a5f5bdaebc45e0fb91aaf80c5140c84263fb2b23bd
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload storage or disposable hosting. These links form a link farm, likely intended to trick users into downloading malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://ketchas.ru/uplcv?utm_term=tamil+mobile+movies+download+2019 PDF link annotation
    • https://jagamimpi.com/contents/files/14844653141.pdfIn PDF document text
    • https://506hlapeta.com/files/file/39768195596.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/nivomomodi.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/56969995048.pdfIn PDF document text
    • https://theelementrama9.com/userfiles/files/1292394525.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/68620431316.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/749aaded57865656b74bbbec86055066/5064629441.pdfIn PDF document text
    • http://synhbio.com/upload/files/rujala.pdfIn PDF document text
    • http://yanartextil.com/firma/files/razopijefovu.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/70520633720.pdfIn PDF document text
    • http://tavio.su/files/file/diluloxusopibumalugur.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2fa23a107106b9e0e6e299eeb5e5a0ea/muxusibex.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/43281482858.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/mefasatafugenesewo.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad4b1938fc---xuvasepiremaginob.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/87154690758.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/16852934428.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/78988372814.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/pexakazalofupitoduli.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/fawugib.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/baxor.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_off0000f85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF85D 10928 bytes
SHA-256: 921a32e77fb4b0ff9a3ad6b9ece39ff5b9b75fa0387231df27b48c68146c38e0
font_01_sfnt_off000111bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111BF 17796 bytes
SHA-256: c179e4caf03227c8e82ab8a6d71e888e85fc16ebd7097257342ffa0f0907ab86
font_02_sfnt_off00013fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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