Malicious PDF — malware analysis report

Static analysis result for SHA-256 f276aa647cb383e1…

MALICIOUS

PDF

87.3 KB Created: 2021-07-28 12:46:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0b96ddbb4f262e6c881baaa87da634e7 SHA-1: 3e57f2a4e753d14d458d5d9159cd7faac6d4a5f0 SHA-256: f276aa647cb383e14405df78697effb2ac3920c2ebfd7fae57f6a3942c3eba96
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious payloads. Heuristics indicate the PDF acts as a link farm, pointing to compromised websites and disposable hosting, likely to distribute further malware or facilitate phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8947

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.
  • 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
  • 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://mn-lawfirm.com/box/userfiles/file/zobotijefuwitepex.pdf In PDF document text
    • https://nadamasristorante.it/file/68037170229.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2c58015b3---wubonopojokexile.pdfIn PDF document text
    • http://www.uniformsolutionsforyou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfeaea47e5---kutek.pdfIn PDF document text
    • http://olneyjune65.com/clients/d/dc/dcef5d22f85ec69f5810ba62c2e8cf46/File/94714379607.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/78166435258.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/db48b013b2c7ba89f009d3f65fe4b2e6/kiwosufuvorav.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/bbab2cec4a91bf7a6046490dcc55e2e6/39125637851.pdfIn PDF document text
    • http://tai-group.com/upload/files/fedevunewovinevimev.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/29722145277.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/zurivegukeliratikijuxupa.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/6169cf42c9c3c3f6ed8bdc01b3e5a7c2/nunata.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/posoxofenikugoraduwizel.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079781f930dc---vemul.pdfIn PDF document text
    • https://novzelandiya.ru/ckfinder/userfiles/files/fozajukosezudevuwunekon.pdfIn PDF document text
    • http://fsanaq.com/upload/file/21062916510318750179jfd66t8kwe.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f5eb6c859a8---tiwekejadejupox.pdfIn PDF document text
    • http://gerocuki.hu/user/file/rapudivesoripuxinobul.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d442ad9356b---xivimususoxazojupofuwo.pdfIn PDF document text
    • https://agermag.ro/mm/file/karejixelavebokuv.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tejoteziroxiwomipomotuga.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/vi4lofhipghoamfened357v6k1/jesezafepufidebaliwix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=ielts+writing+samples+for+general+8+bandPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF8 11228 bytes
SHA-256: 4a5fac420eae0aa9754a8dd44628135c4e66e00a67b493b90a35bd3e73f3036c
font_01_sfnt_off000144e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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