Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcbf45ba3fae3133…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 16:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f413839f9224a6a7d4c0c36591a50895 SHA-1: 6a1f7fb0bbfee0ee5262c8e137480caff8a9c2d3 SHA-256: bcbf45ba3fae3133e4e796ac536ff16f5764ace96029773c2c601a98292633b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The PDF structure itself is also noted as having duplicate object bodies, a common obfuscation technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://jngf.cn/files/file/31148552697.pdf In PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b3df477171c---13189530056.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/meguwe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827d594ac40---82822478797.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/45114761044.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1606ced6080387---dutobifodowedu.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/nevopivu.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/walep.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/rerizexanob.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/jibanalozaxowaxol.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f01ba6e1008c2251495b5ab47e16ab49/medoj.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210825135759.pdfIn PDF document text
    • http://tingchucontrol.com/Uploadfiles/files/josipemugopotarilit.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/wejekenutetasobiw.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/kibupumitufabifo.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/jukoxefus.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/92878450378.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/97298224482.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/2002a8ea968c1229a8df152798ab070f/rowubegele.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vefiwexepubamat.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/8408169626.pdfIn PDF document text
    • http://gocreate.termall.pl/upload/fck/file/11142542490.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/16286434655.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/76200121947.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/d7c9d3bab4f684fa36d51273360e97b6/magamok.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/vezev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=dynasty+sheet+music+pdfPDF 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_off0000d514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD514 10832 bytes
SHA-256: 0b0a0f3b3427a4cf38c1a82912e76d7aaa07d6335469e70ac4876d193f5c0c69
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10602 17968 bytes
SHA-256: 5fe9fbf57891bb1621effe0e990fedf08e12742bf99465a3f533490fa3ee0346

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