Malicious PDF — malware analysis report

Static analysis result for SHA-256 0909d5cf3e9e84bf…

MALICIOUS

PDF

74.2 KB Created: 2021-09-13 12:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7be8c9d8ff1ed65b61d1a19a2488e907 SHA-1: 188dedb070d63433174ff994c5514370c86d1a8e SHA-256: 0909d5cf3e9e84bf34643bad34a18b328c59037933a621625aeb36576a1f2923
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to compromised websites, suggesting an attempt to redirect users to malicious content. The heuristic firings indicate a link farm strategy, likely to obscure the true destination and evade detection. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • 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.
  • 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://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/11eb0c8cdf147900a03d21b648a276a7/perunidumu.pdf In PDF document text
    • https://weborder.cloud/userfiles/file///wowubajila.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132ecc6c875e---92278272451.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/84162362427.pdfIn PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/3519103547.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/81840394863.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/bivowox.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/tipiwom.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/31420943611.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/zorexagajuwusupu.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a1353b04c---59966634913.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/98649385411.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/n984msoj9l6c1t43904kudivu3/629026483.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/88216761787.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133dd0c8d7c8---wapabigetikilavakixedi.pdfIn PDF document text
    • https://bccphil.paramedix.biz/uploadfiles/file/xugarunobemu.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613808f44f986---sijaborudoj.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/dosefopomimafiturojisuve.pdfIn PDF document text
    • http://apart1day.ru/file/71645787208.pdfIn PDF document text
    • https://kokomanis.com/contents/files/9174610461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=download+obb+gta+5+mobilePDF 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_off0000c080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC080 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD897 10684 bytes
SHA-256: ceefe9e4e26c82e1fe2aab962b63167b08e42f2fc5440e915d27f2719ce9fa1d
font_02_sfnt_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 16684 bytes
SHA-256: 3a4b2636b92cea61bff3542702396b5916d305f53203e11c0e964f65f82ee8a9