Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba228ddba3608518…

MALICIOUS

PDF

96.6 KB Created: 2021-07-21 18:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 860ac609082c3f4e489fa476f30b49c0 SHA-1: e4922801f6edb4762489851da0354fe95e879554 SHA-256: ba228ddba36085187254e826700a3c91360d0971a4b148bcba10d64dffaddc03
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to potentially compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm heuristics strongly suggest it's used as a lure, likely for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://china-zzld.com/uploadfile/file///2021070221195525.pdf In PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gefibadavig.pdfIn PDF document text
    • http://earthtalismanjewelry.com/clients/b/b2/b27d4d76c51cd35ccef873a204118430/File/21190009920.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/r5ik8174kk9b2et2ermt0bokl5/kobuwulageruzone.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/02cd4e5ddfa67ef4126657106bfed5a4/61875355725.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/mimozuvewevexuxuneki.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/07629a93a17964c2e43b2e07cdecab36/muvujabovug.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/marega.pdfIn PDF document text
    • http://landbondcorten.com/attachment/file/8df4ca1d2d9cbb8292c1e2775fcc2b77.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/17780478110.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/lewaduguwupikozi.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f7b9a8c3d---21649687358.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/26518724914.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f506950b---talikarogejobinununu.pdfIn PDF document text
    • http://atek-ent.com/upload/file/diraxupijomivolida.pdfIn PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/42114417076.pdfIn PDF document text
    • https://shopabrang.com/images/files/vatozira.pdfIn PDF document text
    • http://gdgom.com/upload/file/210721034357639311uepbou8mweya.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94880414a---mikekitopezarali.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/08e96be15c694fa7814315f8d7a5bea5/buteripomifapezadilu.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088b06004f6d---15901453194.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/94448570536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=is+rice+bad+for+blood+sugarPDF 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_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10640 bytes
SHA-256: 7ea13e1490449bbe7b4df7c3b8534aeddd93e8e27dcbbcb66cd1c4405bfd3417
font_01_sfnt_off000131cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DF 16484 bytes
SHA-256: dc9137d4c23d30b8f920005e6e7e6eda8af06736da04e34c3d5b8f6a12c0f288

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