Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be0c88241a7506a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-20 18:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bf6e7f7c6830f97c33ccc4f30641fe2 SHA-1: 8a8afecf5f0e7164e1e09bac13b66f08dbfcedc7 SHA-256: 2be0c88241a7506a87ef90a6716c5ea7710eb8c5b976e4cb4b2665beb9a195e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://intproplaw.com/admin/uploads/file/gijuwemotuvipinur.pdf In PDF document text
    • http://zatoodesign.com/userfiles/files/94181403833.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/rajutikadorofiwomibofud.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fejatiloremav.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/91291948828.pdfIn PDF document text
    • https://ajur.rest/uploads/userfiles/file/zosivonetegabipelegomo.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/lusagisodegaxapuxuj.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/31428018226.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/gofuvakas.pdfIn PDF document text
    • http://mertcelikkapi.com/userfiles/file/jovara.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909112553.pdfIn PDF document text
    • http://shahgrp.com/uploads/17404937267.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/72479285356.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/jajiki.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/20980749676.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613063303b2de---74174506511.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b79bfc042b---22073988944.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b30da1e9d---biduverinuxajazibebuv.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/6086630356.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/99482407057.pdfIn PDF document text
    • http://3t-t.com/User_File/UpFile/file/20210910185253_eGlnYWdlbm9ydXNpYnVy.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210905095905.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/53108885463.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bakemon+masters+idle+gamesPDF 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_off0000e2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A9 10736 bytes
SHA-256: 8850914e378af96fc478239c3349247766fbf93ce8b7332f8ce08ab86e9da28d
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 17556 bytes
SHA-256: c9b9352df1d350fe82f0b24994782e53e19196bdaf1dd251a74a926877c04472
font_02_sfnt_off0001289c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1289C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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