Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ea33b6f248cd2df…

MALICIOUS

PDF

84.1 KB Created: 2021-07-21 21:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9a9ef68d9eb3d7ba3a31ba2eceed0a9 SHA-1: fcd99d035576b34fff26e2c3519d388f316738fe SHA-256: 7ea33b6f248cd2dfdfd1a1f2d575a214fd7e8e5c360e0f920e55819e8a6b6346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple URLs hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to exploiting users through these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/88e3737877b9b758f507b0fedcf4d3f7/64370270856.pdf In PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608222ee92752---dotuxanolobe.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/nuxodomafurufutajalese.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/63b0c9261ddf4c8f7f563a21276bfa93/43707749224.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/zipifowipavekakoxabineso.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/4d66a9b605e009903500aab3700a4491/91660902927.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2b9095f23---powalemujukaxenowaki.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e76c50f023---42179097340.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/31865680786.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609295be73f06---99309333284.pdfIn PDF document text
    • https://yssnewlessons.org/UserFilesTwo/file/19247699948.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/12540329218.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/mapuwixelifaxexuz.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/33513381464.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8asvvg0qtdoevkeu8u7u1u5546/vomugore.pdfIn PDF document text
    • http://vdtonline.vn/static/uploads/editor/files/kijizuxepitenekelog.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/vi52r8nmkd6vos5s41mll6pek7/bofoxodogibamez.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72f8d3979---4797192118.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/40288959949.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077683096d37---32480115581.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/sosujibitejokak.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160b4877defa2a---soxefozikisepanam.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/ih67qh1jcrnc1gtclfqg45a403/87184640730.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/82532182273.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/2367262856.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/1e8fe2b5aa339036fd57bed8048dacc5/vifupuborinovetetom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+columbian+exchange+for+kidsPDF 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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16392 bytes
SHA-256: 13ab242c18c08a843efd6d464b252b89c5c76accc1875fa849ee642d85e1f98f
font_02_sfnt_off0001282b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1282B 11220 bytes
SHA-256: 23268a693684caeb370a0a896a205520998bfda8944e0607f63327a5496f2316