Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75781cc0cfbf878…

MALICIOUS

PDF

77.1 KB Created: 2021-09-21 20:13:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4f2547cc4dd3730570683f7936d7f384 SHA-1: 9a0523bbda050a3150d08ff8058b9e18e47028af SHA-256: e75781cc0cfbf878e06fce74d152fbe8091c213162b471446be9a1aa9c5f6e05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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 https://garglob.ru/uplcv?utm_term=master+pocket+tv+apk PDF link annotation
    • http://saiprogetti.net/userfiles/files/96074204344.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/64768025161372b84e88f3.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322db8548ba---nuburenifupuleturimab.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/14107521165.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/633dc42ccd5520b29362f6f789ed65db/87399059567.pdfIn PDF document text
    • http://hadt.vn/upload/files/73106257641.pdfIn PDF document text
    • http://ptichile.cl/userfiles/file/22171260846.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/vadafuwavuvasus.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suzugadifizidonokisajux.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138ce1839d0d---80529511775.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/raxakib.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/99187247208.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613b92f3ae823---zufir.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c8485a99c3bd2c5990a905d843143c9b/lokan.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/xomazoruduk.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/88412178347.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/23252527988.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xadavobuse.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16138addf4b3e3---72818720790.pdfIn PDF document text
    • https://slide-bearing.com/d/files/61202156633.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/nebulisobamusakuvora.pdfIn PDF document text
    • https://laps.pl/userfiles/file/wavalokakuxozerir.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/29468158689.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/maxez.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/56281572951.pdfIn PDF document text
    • http://djapm.com/userfiles/file/tuxuxijonitumobapoxekis.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_off0000c8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DF 17800 bytes
SHA-256: 7e185eb1fb9d5dd108d38d84dbc01cf06e31803a009a796e5680aea1730e7f82
font_01_sfnt_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10276 bytes
SHA-256: f26ac8a64fb9685ab70f7efee85dc6bc8efce9ad34ecf94269f5a7c91f2bd0de
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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