Malicious PDF — malware analysis report

Static analysis result for SHA-256 48e99191fa9429da…

MALICIOUS

PDF

86.0 KB Created: 2021-09-21 16:16:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb8df2163c3f21384b56339d5e39305c SHA-1: e0516d3c32bf118376b314af1de595976b92cd13 SHA-256: 48e99191fa9429dac2a29bfa4ef450e300a3e8a8e2177f1d0d89ff24ec8b9d1d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://smidgel.ru/uplcv?utm_term=thoptv+app+download+apk PDF link annotation
    • https://shriramsteels.in/public/ckfinder/userfiles/files/46755317946.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/88878432076.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471b61ab365---razolodajabulozosuleter.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2109191352140632310y2ysl.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/b08100074119ec458c597d081800fb1f/fenapatikidisobisifedaz.pdfIn PDF document text
    • https://ebus.myskoolapp.com/FCKeditor/FCKimgUpload/file/muzotiken.pdfIn PDF document text
    • https://mogilew.ru/userfiles/file/88994811048.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/b9952de263f69153ffc56b5396c9b6d1/zoloredud.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/ronebutofoveromenovobomop.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2381a89c8---refinuvepazimu.pdfIn PDF document text
    • http://stellarp.com/userfiles/file/pativovutemulesazesimejov.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136bb0859689---mufobiwobe.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210904025640.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/timesa.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/42077741506.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/lalaketez.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/a934c759cb78154e051afdcf7b0aadf7/pofaso.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141576cb2120---77767018511.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/pagiwam.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/zakebawam.pdfIn PDF document text
    • http://ayurvedicclinic.org/userfiles/file/11380594415.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147ed56eebee---59526485314.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/35211096788.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/59687309465.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/pupawezajipovabejevufo.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1jruft6ecb9ln7l8fmeqq11vm1/55615543778.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/lovopuzigebupiwa.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_off0000ee20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 17848 bytes
SHA-256: 155acf4ae16c290bac66398b12a68ccb124962a7bbcc642dfd46af17fed01037
font_01_sfnt_off00011bc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC9 10204 bytes
SHA-256: e69be4bf5f7e054c00fdf8965770ac0d6a2f3cda8c49a35c987fba3333e74f85
font_02_sfnt_off000132a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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