Malicious PDF — malware analysis report

Static analysis result for SHA-256 28e84b35ac584ff4…

MALICIOUS

PDF

94.2 KB Created: 2021-09-03 05:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b0d519385aa0bbf7c07ad1eb8e900de0 SHA-1: 6b056221131a8227f97dbaf5e37090111db1a92b SHA-256: 28e84b35ac584ff4bb5db0a21abdcb17e43d1c4e3820b67502507e6d808b2f6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or scam campaign. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics confirm its malicious nature, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The embedded URLs are likely used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ketchas.ru/uplcv?utm_term=psychology+of+religion+books+pdf PDF link annotation
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a9948c64---wuvevanisaji.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/ml6b9g3u7cgpm210oi4vqdlmi0/25710764774.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/bff7597a0e76b54cea497a7f717f33be/22972639020.pdfIn PDF document text
    • http://wchs65.org/clients/b/bb/bb65574a37642f7fe3135935df861e67/File/96153927058.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c00b05c62---bopagifurumopufiw.pdfIn PDF document text
    • https://globalquestconsulting.com/userfiles/files/49568989074.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dadiwutozamopokevarokiri.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/figubojikepaso.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/livegebege.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/fukufuvakezajalupajov.pdfIn PDF document text
    • http://contextuae.com/resimler/files/82258949237.pdfIn PDF document text
    • http://888chji.com/userfiles/files/58508236525.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/30227213346.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/40681896974.pdfIn PDF document text
    • http://skia22.ru/pic/file/lologiralolitikirizitenig.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/90d600d406e7a2e6fd4728f74d9e236a/kokakorubedikunapan.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/92710408415.pdfIn PDF document text
    • http://flirdining.com/uploads/files/15016251597.pdfIn PDF document text
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/3334rjcc58hlg4be0kf18b8td0/jobopigasot.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079160f1029d---tajinulupeligida.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ae889201d---kisonalizukudusex.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/75160446286.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/unrogs81v343ooeovss8r9nvma/fatazifuwasagimatu.pdfIn PDF document text
    • https://olterus.info/contents//files/47407729320.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_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 10984 bytes
SHA-256: b1ce1ed50d0fe5948c40bdf835bcd090b130980df92d24dbfc02ba9eadbc4146
font_01_sfnt_off0001251b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251B 17568 bytes
SHA-256: cc4411949f266375ff58472eda2c300df8a8fa567ffc3ed0a0013d93c86757b4
font_02_sfnt_off000152e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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