Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d2848a20afd8fd6…

MALICIOUS

PDF

79.5 KB Created: 2021-09-15 22:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e6f05721f977e0b7455604997aaef57a SHA-1: 8422d6f31f039a824ef66c9207aaa3735b22dfb8 SHA-256: 2d2848a20afd8fd68f41a5a9e27974545bb950c6dd8bf19da146aff052e1882e
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The embedded URLs and link farm structure suggest the primary goal is to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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=turn+phone+into+radio+station PDF link annotation
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/1973504327.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/bitamapejek.pdfIn PDF document text
    • http://sin-hua.org/userfiles/xujuranedagexa.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1614153ec0358a---77674318764.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210910084442.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/1dc53c954bdd2bfa50e5f6cb1ec27d78/gezidolesesifepaf.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/68059537811.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/61358151131.pdfIn PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/91943745002.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/xaxojura.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630632852_da88072c6e.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/jomozufimimeb.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/zudewa.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/gerofawebajinexir.pdfIn PDF document text
    • https://andana.us/files/files/22501822203.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/goziwoda.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/640410128f5ccc1d1d2c992930859243/31521670984.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/73430189135.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/49653224871.pdfIn PDF document text
    • https://equimat-cheval.fr/file/sedofiri.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/86096292329.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/20135731274.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/24717194049.pdfIn PDF document text
    • http://aweibel.com/Photo/file/86047407609.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2F 10504 bytes
SHA-256: 21997930ec91009eb1591f0d9d84332ade5d525bdebc948dd4fdf553c11bb432
font_02_sfnt_off000105fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105FE 16652 bytes
SHA-256: 2a2b51b56881e99c104db6dea6681158870bf7128dab026a1096b7ded3271512