Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6128ab7c4605625…

MALICIOUS

PDF

81.2 KB Created: 2021-09-05 17:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d4dbc1079543c94e8991519057d335f0 SHA-1: 92f287e27c91aaaf01fedbaff36156ed842b9854 SHA-256: e6128ab7c4605625fbd8a49370cdc80a74b847711e5cebb3a3243a27abfffce4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple domains, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of a 'download button' heuristic further supports this phishing-like lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ildongwire.com/userfiles/file/92673012777.pdf In PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/2o8c53h58snrrseck18m1ak6ml/95510215824.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f577cc07f561ff608b36d90307fcd90d/tifabogijesijutugixunepas.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/lazutewizajuxe.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/woxeroli.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919a47b9955---duninenovelavu.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/28117362416.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/99699487767.pdfIn PDF document text
    • http://gardatrans.com/content/Files/gaman.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/74d1fc2ff0eca48a79d49eae28298be1/51453756172.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/44856645324.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/84405842307.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/zegibamorebegor.pdfIn PDF document text
    • http://evola.it/userfiles/files/43005854898.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/modizagozufabo.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/vjjclsa3uitpmtd9dejfq5b4mo/33870892786.pdfIn PDF document text
    • https://lrsdev.com/userfiles/file/tofefewa.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/473c22272ada12749ae240d2e8615183/jikugakigejiriruse.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/bekasomajutufasexod.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/43217747125.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/cb0otjlrh3d6klog6iiehobb06/lezevepez.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/7732d7fb06ecef7d4c7880e1d2f1e18c/tovoza.pdfIn PDF document text
    • http://statewideroadservices.com/clients/879378/File/tukokopatabewowagisijeduv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=hibernate+tutorial+pdf+javatpointPDF 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_off0000d26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA82 10752 bytes
SHA-256: 5cae3a04a0b8dde4bab90fd1b82c2124b13d15500ee62cdd01d10f9fd0dee7ad
font_02_sfnt_off00010304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10304 19900 bytes
SHA-256: 21008dc90ec12cc21aa9c75f939c72f25e9370054aea36385802d9729ab50429