Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc60e2b70c459ff7…

MALICIOUS

PDF

83.8 KB Created: 2021-09-17 05:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 31c3beee6ad6ef7ab1b2ddd08f11ed2a SHA-1: d8eec3432308acba24b1a9915742da00f719e1fc SHA-256: bc60e2b70c459ff738ac4962c2360113ccef0d03d64996c2e6b8cd48fd1c64d5
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farms pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=sdk+manager+platform+tools PDF link annotation
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/12725574913.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/damenejisev.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/10466952258.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134a98cc441b---41516693797.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/18256300472.pdfIn PDF document text
    • http://american-security-inc.com/assets/ckfinder/userfiles/files/48182711970.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/lenekokof.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/37246237888.pdfIn PDF document text
    • http://arablift.net/userfiles/file/54515028724.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/44196868480.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/sekovagixudamudexamorati.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/aach5sp04ikvfmh94uif209a89/30078459117.pdfIn PDF document text
    • http://k1a.ru/images/files/file/xuwivosexawulanesi.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210911131531122.pdfIn PDF document text
    • https://curvy.tw/upload/files/15381752780.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161315c1b29a88---setuwatuxijaxubi.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c431b0b7bc---62266321385.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/21580335398.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/16166873847.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/refuvafat.pdfIn PDF document text
    • http://sensor4you.com/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/66797256618.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136a4d756ca4---77964460031.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/puzorebomipepuxufogowaxi.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/tuxifiwatowolavumorigap.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_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA60 10916 bytes
SHA-256: 37c19b2d74ef320a440369b372717f648724426af92634a2d3d306a0863b2d11
font_02_sfnt_off0001136d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136D 17528 bytes
SHA-256: e17fe62d6ff319023867b493007ffffaa87a4268381d469fbe177a16010bcdbc

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