Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a6913b34acddc7c…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 12:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 16551773a0937c1f721845114d207742 SHA-1: 572d71237fe46e5facbf6017e431de83b8f26d5a SHA-256: 0a6913b34acddc7c9ff78940bcb5186c46f80e8cc24a1a9c32a6c2e8dde73417
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and hosted on various domains, suggesting a phishing or malware distribution attempt. The presence of multiple links to potentially compromised WordPress sites reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/e590b652af51abd80569e0621bc6b5b4/87913701964.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/61313a2vikbt3f0mdhofct0c13/monezitujitiwizozako.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/paluwiwejom.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee27bf012d7---fupurujakidotobeful.pdfIn PDF document text
    • http://www.christianhouseshare.com.au/ckfinder/userfiles/files/xataniginezamozinetifo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/rufodowedutivamifewiwev.pdfIn PDF document text
    • http://cardealer-space.com/js/upload/files/wixorujenadusuwi.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/fqc4v9ivgo4h3dijalp7o4eqhq/72687860664.pdfIn PDF document text
    • https://oceanflowerhotel.com/uploads/image/files/sabazidevosuguto.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/56501079178.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/vibegamitote.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713e22ae472---jenatorut.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/35946393395.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/1a977e1e4bf4677e27499b7d3f884d99/furerawujusezoxof.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dadd5807115---ravosapawixi.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5f5c9b94711f1c96ca5f20ef77e6b458/20161005322.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf861b58f9---92139434310.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/jemijaledira.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/11820358421.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c9594e32664---kosinajemupadutomogojiwux.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/rodalekirupufiteromom.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b015e7a0a1---norolisaduzekukuf.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sobavifonuvumajabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2019+subaru+impreza+manual+leasePDF 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_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 17736 bytes
SHA-256: adcc788f3e83c02eb2a1ba2d07a4bc370b365ccb0fa5c8d270a53b6dfc429ce3
font_01_sfnt_off000106f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F7 10860 bytes
SHA-256: 12e65b542cc6e77bfec1f36d41b0c8695005413d657555880b42d12297f319ed
font_02_sfnt_off00011fe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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