Malicious PDF — malware analysis report

Static analysis result for SHA-256 2635f12e8c0538f2…

MALICIOUS

PDF

70.8 KB Created: 2021-09-23 20:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89b6701e552ac741d9eb87b620059817 SHA-1: abd5b2823bf8f808da3cd4680101a6c198ff47fb SHA-256: 2635f12e8c0538f28c9358f754d9e453c748f7f0a345f18bd766e274c76ff7e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a significant number of external links. Several of these links point to compromised CMS upload storage and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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 http://zhfangyuan.com/uploadfiles/files/butagugufesivoxajozidag.pdf In PDF document text
    • http://lamorenj.com/userfiles/files/jotorobasagosilapufavane.pdfIn PDF document text
    • https://ever-progress.com/upload/files/visaterixivikiti.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/96955659307.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/28596483105.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/4b463e0647b8517e717694096a229b2c/zamililulegadupazas.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/xobevalajijiluluvodogexin.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f22db5c290---lepuja.pdfIn PDF document text
    • https://mimpishio2.com/contents/files/56815387687.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/tepanaxekorekafovozima.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/tosunimaj.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-11/images/files/77108105634.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/e651bfa0a2a43df71758f1ee265d1b33/zevizerobezolov.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/89991486776.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/vabimuminaj.pdfIn PDF document text
    • http://djk-winkel.de/images/uploads/file/fivejutezod.pdfIn PDF document text
    • http://donghotam.com/luutru/files/dawokimurupiwudatexepup.pdfIn PDF document text
    • http://trlgpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/84422142777.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de50fbfda7---79592366732.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/kijezi.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16136c5fed65e2---vapumoguzigijewonoto.pdfIn PDF document text
    • http://sacmacbook.net/userfiles/file/94770201411.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c5077155bf---bavamelowugilezapek.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/13056957960.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/somizokotexutoli.pdfIn PDF document text
    • http://gazomotor.com/allinone/file/zopupafewamev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+late+late+show+with+james+corden+watch+episodes+online+freePDF 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_off0000b4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FE 15148 bytes
SHA-256: 54683e698087fc549c2415d106a85e812fb88ffcc1332b54279757619de7eef6
font_01_sfnt_off0000db75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 11064 bytes
SHA-256: 8667cdd96672ffb91fe7f74c4a038bb35c90feec53d1e782d8dbf99179bd3db8
font_02_sfnt_off0000f50f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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