Malicious PDF — malware analysis report

Static analysis result for SHA-256 10384b50fab87577…

MALICIOUS

PDF

329.9 KB Created: 2021-06-27 05:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 681a56273b4ea77f4823a218e3daa147 SHA-1: bc7f5db862484d5b7e0f22b0bd311abe7d9699f9 SHA-256: 10384b50fab87577f7361cd684b6f13b6edead4b88343e6d484921acb765b505
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The embedded URLs and link farm heuristics point to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=masaccio+was+a+significant+painter+because+he+helped+to+pioneer PDF link annotation
    • http://wonsakai.com/uploads/files/92863571472.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609feadb2f5ab---86362332712.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/sunemoz.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d994e3543---94567185675.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/3bdf25be787120716c9806144427bc88/95887194467.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e60a957a2b---jedoviwakowebiji.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609da9c3e0b35---noninazeviranutij.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/pp3vvmfl2j7e4s2d1lujq3ftm6/tejasaxax.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16077d31ac417a---ranufewagatimilonuw.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7us6i4qp1v5q60133ktfqjaao3/goripilotubirirojifarofil.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6568a9f33f---somixodejesewara.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1090d8103e---legibiwukifakag.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/41da290a3d25cfd8636a0f49101b9e70/94401868941.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/679105bbb591b67a84f81eada42c8e56/rakiwuguw.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfff83e29fa---wevumelat.pdfIn PDF document text
    • http://cdkkck.com/uploadfile/file/20210602203619.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6b013ff61---gitewexupawozoforatiledot.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/kusedamepitodokosiw.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_off0004b177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B177 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0004c989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C989 21324 bytes
SHA-256: c7504b72c6a7a552c6832508f1960cda5f90477dbc21ced157e13e8713d6c1bb
font_02_sfnt_off0004ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF1E 11216 bytes
SHA-256: 25cf1f81ac766e47e1076281f6ce687e4947fa9c1592344d47fed5f72fee23b0