Malicious PDF — malware analysis report

Static analysis result for SHA-256 019f6c63ca707bc9…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 17:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0c408fa6f8e48e0988633dd01d732440 SHA-1: 6bcfe24a3c54d5b9f85126c1fd3fe4c6f8cdee04 SHA-256: 019f6c63ca707bc9df3622637b58769627cd8cb60d842c256f1a343f2df412d2
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and multiple external URIs, including links to compromised CMS uploads and link farms on disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • 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 https://irlanc.ru/uplcv?utm_term=chrome+apk+download+for+android PDF link annotation
    • https://avphunter.ro/ckfinder/userfiles/files/koganuneloraveriguw.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed2e23b792---namegonipumanatixed.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/ximanezavitaxada.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/9111061831.pdfIn PDF document text
    • http://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/firugafalupedum.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/nuvegawopetoduxivej.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/31914060337.pdfIn PDF document text
    • http://www.buildonhope.org/file/22110135275.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/80378503399.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613414d3e854f---43237747972.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142692b1b0eb---ruden.pdfIn PDF document text
    • https://shibbirs.com/media/files/43007640964.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/zuwegizikuxakupezu.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/bujer.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/viferetejokumaluxusageji.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/10425388025.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16131a332a2e04---duxenagiwarakut.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jajuvuxibadugodebizuf.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/vujaluvisubemute.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/ditaduxudodilavilunimem.pdfIn PDF document text
    • http://dzbnf.com/upload/file///nedotuzarajuxuxoma.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/88653031183.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/jepibudagab.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gebabugurokasajow.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/43678209932.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/fidipune.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_off0000d4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A7 10704 bytes
SHA-256: cb773aaddc68aa2e88a25bb18b7c323fc2b849797c4486786b82e65c20ecd708
font_01_sfnt_off0000ed0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001051f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051F 17976 bytes
SHA-256: b1195cd0b606dc84092d9d499a4a3f3365622862bd64703f6e62bf82fb55ab3f

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