Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9d1263d1c8e144d…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 05:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d1c600e3ec5d8030692ec62dee053ddd SHA-1: 58d1581f462a347939748cae663968b2af51e87c SHA-256: c9d1263d1c8e144dcdb7f12ecd2b35f3fbcf2c83b3f4eefe8b91dc0c689503e3
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm and pointing to compromised CMS uploads, indicating a phishing or SEO poisoning attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=stylistic+devices+definition+and+examples+pdf PDF link annotation
    • http://flemingdecal.com/uploads/assets/file/buwapi.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/kazopesuburu.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161072eacc0bb9---pilem.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/37471588641.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/winozadujolesagoloru.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/27500788984.pdfIn PDF document text
    • http://www.bandungmesin.com/file/79183520943.pdfIn PDF document text
    • http://inse.us/uploads/images//files/pewewisofisuropogajufesad.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/j7s17fsraqnug4a92q3bilivci/kivolobuwixuvigimokud.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f3aa894146e---66975584738.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/h2b0vp4lipncblrfbjm4fi1eh3/8334495883.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gibamovafepab.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2d5f6cc79f9e2c6f4f84e7f852587494/nimetezetesatagowu.pdfIn PDF document text
    • http://jessicarossitto.com/clients/7/7c/7c16b8c799dae9ffcd1258f31d6ff645/File/terowoganave.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vi2nfn170vvigl3u84i4e5b7h4/xanerujizabutugozojise.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/65737558970.pdfIn PDF document text
    • http://diamond6ranch.com/userfiles/file/68657923685.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/b99a3b121ef702b9514f4aa29e88fc01/nalorejatinelukubavazubo.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/62067752664.pdfIn PDF document text
    • https://cmflower-kkc.com/ckfinder/userfiles/files/mejig.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/sazubesas.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/668b470007fe0db7d21b4ce25228df23/matewukemegurapipenore.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/fejorutafawegaputodiloti.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_off0000bb0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB0A 15272 bytes
SHA-256: aede14d0cfc0e3eb8d4913a63cc089a8120c3ddae62ea30bb67c264befe285a2
font_01_sfnt_off0000e1b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B8 11036 bytes
SHA-256: db8e8befa81439c1052a7ad8a1ee69b92edcaeb554dd5bef7ba06c75d1088567
font_02_sfnt_off0000fb6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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