Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f8ad2aaf665f11…

MALICIOUS

PDF

69.5 KB Created: 2021-09-04 03:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 830163e730f8704fd6edd79c5f7fd44b SHA-1: 051e31848bc3491d3a8886856a84836d35cc5368 SHA-256: 04f8ad2aaf665f11c9b649283709cdc6e45fd109f4125bdab1ebdb03139ed78a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/0096792ce30f6f35268aaefc57ffcbc9/ragotowexalaxaritu.pdf In PDF document text
    • http://tradeweb.es/userfiles/file/jusisatesudoxofusupaduwu.pdfIn PDF document text
    • https://betenagro.com/sites/default/files/file/83301611739.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076624493270---78997840751.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/5645604694.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/bitisozikikusomar.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/d8a3041ac70910d3aa864235d0fa90d2/24620323939.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/widoxaxopezili.pdfIn PDF document text
    • http://ty-int.com/files/files/gevabixememotipep.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/feruxodobenelifu.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/51196057778.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16083f026590c0---wewalawibubobeletu.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/dotobibatidutakamu.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/85073553845.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/35427785266.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4idvccvjj81sj63ga4i4pan1h7/58637966431.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/bfd554b201046403466502b11ba29f60/tenejutapuvukas.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/88077890292.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/javalegumovugidijagox.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/mevisafaporudigoroxeziwoz.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a392e835182---pikikufubusefasobezurepur.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d7f90428---fujikosowedawivifigerupa.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a59c3ceab02f40b292b64780224588e0/fuwoteridare.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/61460010596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=time+worksheets+grade+4+printablePDF 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_off0000b246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB246 14804 bytes
SHA-256: fa7a4a097dd3c0d7a5bb6129e042eae27f1071cb51130a9026037aa3b5565bb6
font_01_sfnt_off0000d6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B4 11196 bytes
SHA-256: 37e466c1c5c379fd6fd9b09bb688b69f8e70128b1e07464970e488ecd6cd369e
font_02_sfnt_off0000f063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF063 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1